420 (number)

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419 420 421
Cardinal four hundred twenty
Ordinal 420th
(four hundred and twentieth)
Factorization 22× 3 × 5 × 7
Roman numeral CDXX
Binary 1101001002
Ternary 1201203
Quaternary 122104
Quinary 31405
Senary 15406
Octal 6448
Duodecimal 2B012
Hexadecimal 1A416
Vigesimal 11020
Base 36 BO36
For other uses, see 420 (disambiguation).

420 is the natural number following 419 and preceding 421.

420 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.