20,664
20,664 is a composite number, even.
20,664 (twenty thousand six hundred sixty-four) is an even 5-digit number. It is a composite number with 48 divisors, and factors as 2³ × 3² × 7 × 41. Its proper divisors sum to 44,856, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x50B8.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 18
- Digit product
- 0
- Digital root
- 9
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 46,602
- Recamán's sequence
- a(42,511) = 20,664
- Square (n²)
- 427,000,896
- Cube (n³)
- 8,823,546,514,944
- Divisor count
- 48
- σ(n) — sum of divisors
- 65,520
- φ(n) — Euler's totient
- 5,760
- Sum of prime factors
- 60
Primality
Prime factorization: 2 3 × 3 2 × 7 × 41
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√20,664 = [143; (1, 2, 1, 286)]
Period length 4 — the block in parentheses repeats forever.
Representations
- In words
- twenty thousand six hundred sixty-four
- Ordinal
- 20664th
- Binary
- 101000010111000
- Octal
- 50270
- Hexadecimal
- 0x50B8
- Base64
- ULg=
- One's complement
- 44,871 (16-bit)
- Scientific notation
- 2.0664 × 10⁴
- As a duration
- 20,664 s = 5 hours, 44 minutes, 24 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵κχξδʹ
- Mayan (base 20)
- 𝋢·𝋫·𝋭·𝋤
- Chinese
- 二萬零六百六十四
- Chinese (financial)
- 貳萬零陸佰陸拾肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 20,664 = 6
- e — Euler's number (e)
- Digit 20,664 = 6
- φ — Golden ratio (φ)
- Digit 20,664 = 0
- √2 — Pythagoras's (√2)
- Digit 20,664 = 4
- ln 2 — Natural log of 2
- Digit 20,664 = 4
- γ — Euler-Mascheroni (γ)
- Digit 20,664 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 20664, here are decompositions:
- 23 + 20641 = 20664
- 37 + 20627 = 20664
- 53 + 20611 = 20664
- 71 + 20593 = 20664
- 101 + 20563 = 20664
- 113 + 20551 = 20664
- 131 + 20533 = 20664
- 157 + 20507 = 20664
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 82 B8 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.80.184.
- Address
- 0.0.80.184
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.80.184
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 20664 first appears in π at position 57,325 of the decimal expansion (the 57,325ordinal-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.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.