420 (number)
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420 is the natural number following 419 and preceding 421.
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| 420 | |||
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| Cardinal | Four hundred and twenty | ||
| Ordinal | 420th | ||
| Factorization | <math>2^2 \cdot 3 \cdot 5 \cdot 7<math> | ||
| 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.
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.
- The number 420, time 4:20, or date April 20 (4/20) has significance within drug culture, for more, see: 420 (drug culture).
- The year 420 BC, or AD 420
External links
- 420Sailing.org (http://www.420sailing.org/)