420 (number)
Encyclopedia : 4 : 42 : 420 : 420 (number)
- For other uses, see 420 (disambiguation).
| |||
| 420 | |||
|---|---|---|---|
| Cardinal | Four hundred and twenty | ||
| Ordinal | 420th | ||
| Factorization | [2^2 \cdot 3 \cdot 5 \cdot 7] | ||
| 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.
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