420 is the natural number following 419 and preceding 421. A natural number is either a positive integer (1, 2, 3, 4, ...) or a non-negative integer (0, 1, 2, 3, 4, ...). The former definition is generally used in number theory, while the latter is preferred in set theory and computer science. ...

List of numbers — Integers << 0 100 200 300 400 500 600 700 800 900 >> This is a list of articles about numbers (not about numerals). ... The integers consist of the positive natural numbers (1, 2, 3, …), their negatives (−1, −2, −3, ...) and the number zero. ... In mathematics, −1 is the integer greater than negative two (−2) and less than 0. ... 0 (zero) is both a number and a numeral. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ... 200 is the natural number following 199 and preceding 201. ... Three hundred is the natural number following two hundred and ninety-nine and preceding three hundred one. ... Four hundred is the natural number following three hundred ninety-nine and preceding four hundred one. ... Five hundred is the natural number following four hundred ninety-nine and preceding five hundred one. ... Six hundred is the natural number following five and hundred ninety-nine and preceding six hundred and one. ... 700 (seven hundred) is the natural number following 699（six hundred ninety-nine） and preceding 701（seven hundred one）. Cardinal Seven hundred Ordinal 700th Factorization Roman numeral DCC Binary 1010111100 Duodecimal 4A4 Hexadecimal 2BC Vigesimal 1F0 It is the sum of four consecutive primes (167 + 173 + 179 + 181). ... 800 is the natural number following 799 and preceding 801. ... Nine hundred is the natural number following eight hundred ninety-nine and preceding nine hundred one. ... Cardinal 1000 one thousand Ordinal 1000th Numeral system Factorization Prime Divisor(s) Roman numeral Unicode symbol(s) , , Greek Prefix chilia Latin Prefix milli Binary 1111101000 Octal 1750 Duodecimal 6B4 Hexadecimal 3E8 1000 (one thousand) is the natural number following 999 and preceding 1001. ...
420
Cardinal	Four hundred and twenty
Ordinal	420th
Factorization
Roman numeral	CDXX
Binary	110100100
Hexadecimal	1A4

It is the sum of four consecutive primes (101 + 103 + 107 + 109). 420 is a zero of the Mertens function and is sparsely totient. It is a pronic number, and the smallest number divisible by the numbers 1 to 7, and as a consequence of that it is a Harshad number in every base from 2 to 10 except base 5. It is a 141-gonal number. In linguistics, cardinal numbers is the name given to number words that are used for quantity (one, two, three), as opposed to ordinal numbers, words that are used for order (first, second, third). ... Commonly, ordinal numbers, or ordinals for short, are numbers used to denote the position in an ordered sequence: first, second, third, fourth, etc. ... In mathematics, factorization or factoring is the decomposition of an object (for example, a number, a polynomial, or a matrix) into a product of other objects, or factors, which when multiplied together give the original. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system (base 2 numerals) represents numeric values using two symbols, typically 0 and 1. ... In mathematics and computer science, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. ... In mathematics, a root (or a zero) of a function f is an element x in the domain of f such that f(x) = 0. ... In number theory, the Mertens function is where μ(k) is the Möbius function. ... In mathematics, a sparsely totient number is a certain kind of natural number. ... A pronic number, or oblong number or heteromecic number, is a number which is the product of two consecutive nonnegative integers, that is, n(n + 1). ... A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ... In mathematics, a polygonal number is a number that can be arranged as a regular polygon. ...

Other fields

420 is also:

• 420 dinghy is a class of double handed sailing vessels for young sailors to practice on before progressing to 470 dinghy.
• 420 has significance within drug culture; for more, see 420 (cannabis culture).
• The year 420 BC or 420
• The number 420, time 4:20, or date April 20
• A Bangladeshi, Indian, or Pakistani ethnic slur. A person acting fraudulently to cheat somebody out of their belongings; a confidence trickster. From Section 420 of the Penal Codes of Bangladesh, India, and Pakistan covering such activity. The Penal Codes of all three countries are inherited from the Indian Penal Code of 1860 instituted by the British rulers of the Indian Subcontinent, which then included the present-day countries of Bangladesh, India, and Pakistan. A popular 1955 Hindi film from India, Shri 420 (in English: Mr. 420) has a central character who becomes a con man, hence "Mr. 420". Not to be confused with the association of '420' with marijuana in the USA.
• A state route in Pennsylvania that runs north and south through Delaware County, just west of Philadelphia.

The International 420 Class Dinghy is a monohull planing dinghy with centreboard, bermuda rig and centre sheeting, designed for a crew of two. ... Sailing at sunset Wooden sailing boat Sailing is the skillful art of controlling the motion of a sailing ship or smaller boat, across a body of water. ... The 470 is a monohull planing dinghy with centerboard, bermudan rig and center sheeting, designed for a crew of two. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Centuries: 6th century BC - 5th century BC - 4th century BC Decades: 470s BC 460s BC 450s BC 440s BC 430s BC - 420s BC - 410s BC 400s BC 390s BC 380s BC 370s BC Years: 425 BC 424 BC 423 BC 422 BC 421 BC - 420 BC - 419 BC 418 BC... // Events End of the Jin Dynasty in China. ... A pocket watch. ... April 20 is the 110th day of the year in the Gregorian calendar (111th in leap years). ... The following is a list of ethnic slurs that are, or have been, used to refer to members of a given ethnicity (or in some cases, nationality, region, or religion) in a derogatory or pejorative manner. ... Shri 420 (Mr. ... Official language(s) None Capital Harrisburg Largest city Philadelphia Area  - Total  - Width  - Length  - % water  - Latitude  - Longitude Ranked 33rd 119,283 km² 255 km 455 km 2. ... Delaware County is a county located in the U.S. state of Pennsylvania. ... Philadelphia is a village located in Jefferson County, New York. ...

See also

• 420 (cannabis culture) National "Get High" day

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External links

• 420Sailing.org