20,420
20,420 is a composite number, even.
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 8
- Digit product
- 0
- Digital root
- 8
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 2,402
- Recamán's sequence
- a(86,376) = 20,420
- Square (n²)
- 416,976,400
- Cube (n³)
- 8,514,658,088,000
- Divisor count
- 12
- σ(n) — sum of divisors
- 42,924
- φ(n) — Euler's totient
- 8,160
- Sum of prime factors
- 1,030
Primality
Prime factorization: 2 2 × 5 × 1021
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- twenty thousand four hundred twenty
- Ordinal
- 20420th
- Binary
- 100111111000100
- Octal
- 47704
- Hexadecimal
- 0x4FC4
- Base64
- T8Q=
- One's complement
- 45,115 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋 𒌋𒌋
- Egyptian hieroglyphic
- 𓂍𓂍𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵κυκʹ
- Mayan (base 20)
- 𝋢·𝋫·𝋡·𝋠
- Chinese
- 二萬零四百二十
- Chinese (financial)
- 貳萬零肆佰貳拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 20,420 = 8
- e — Euler's number (e)
- Digit 20,420 = 5
- φ — Golden ratio (φ)
- Digit 20,420 = 3
- √2 — Pythagoras's (√2)
- Digit 20,420 = 6
- ln 2 — Natural log of 2
- Digit 20,420 = 6
- γ — Euler-Mascheroni (γ)
- Digit 20,420 = 1
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.
The digit sequence 20420 first appears in π at position 5,954 of the decimal expansion (the 5,954ordinal-suffix:th digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.