|This article does not cite any references or sources. (August 2009)|
|Cardinal||four hundred and twenty|
(four hundred and twentieth)
|Factorization||22· 3 · 5 · 7|
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.