20,420
20,420 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 8
- Digital root
- 8
- Palindrome
- No
- Reversed
- 2,402
- Divisor count
- 12
- σ(n) — sum of divisors
- 42,924
Primality
Prime factorization: 2 2 × 5 × 1021
Divisors & multiples
Representations
- In words
- twenty thousand four hundred twenty
- Ordinal
- 20420th
- Binary
- 100111111000100
- Octal
- 47704
- Hexadecimal
- 0x4FC4
- Base64
- T8Q=
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 20420, here are decompositions:
- 13 + 20407 = 20420
- 31 + 20389 = 20420
- 61 + 20359 = 20420
- 67 + 20353 = 20420
- 73 + 20347 = 20420
- 79 + 20341 = 20420
- 97 + 20323 = 20420
- 151 + 20269 = 20420
Showing the first eight; more decompositions exist.
UTF-8 encoding: E4 BF 84 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.79.196.
- Address
- 0.0.79.196
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.79.196
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This passes the ABA routing number checksum and matches the Federal Reserve numbering scheme.
Banks operate many routing numbers per state and division; an unmatched checksum-valid number can still be a real RTN at a smaller institution.