20,801
20,801 is a composite number, odd.
20,801 (twenty thousand eight hundred one) is an odd 5-digit number. It is a composite number with 8 divisors, and factors as 11 × 31 × 61. Written other ways, in hexadecimal, 0x5141.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 5
- Digit sum
- 11
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 10,802
- Recamán's sequence
- a(42,237) = 20,801
- Square (n²)
- 432,681,601
- Cube (n³)
- 9,000,209,982,401
- Divisor count
- 8
- σ(n) — sum of divisors
- 23,808
- φ(n) — Euler's totient
- 18,000
- Sum of prime factors
- 103
Primality
Prime factorization: 11 × 31 × 61
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√20,801 = [144; (4, 2, 3, 3, 3, 5, 1, 5, 22, 57, 1, 1, 1, 4, 2, 17, 1, 1, 2, 1, 3, 4, 4, 4, …)]
Representations
- In words
- twenty thousand eight hundred one
- Ordinal
- 20801st
- Binary
- 101000101000001
- Octal
- 50501
- Hexadecimal
- 0x5141
- Base64
- UUE=
- One's complement
- 44,734 (16-bit)
- Scientific notation
- 2.0801 × 10⁴
- As a duration
- 20,801 s = 5 hours, 46 minutes, 41 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓏺
- Greek (Milesian)
- ͵κωαʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋠·𝋡
- Chinese
- 二萬零八百零一
- Chinese (financial)
- 貳萬零捌佰零壹
Digit at this position in famous constants
- π — Pi (π)
- Digit 20,801 = 7
- e — Euler's number (e)
- Digit 20,801 = 1
- φ — Golden ratio (φ)
- Digit 20,801 = 0
- √2 — Pythagoras's (√2)
- Digit 20,801 = 2
- ln 2 — Natural log of 2
- Digit 20,801 = 8
- γ — Euler-Mascheroni (γ)
- Digit 20,801 = 2
Also seen as
UTF-8 encoding: E5 85 81 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.81.65.
- Address
- 0.0.81.65
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.81.65
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 20801 first appears in π at position 33,648 of the decimal expansion (the 33,648ordinal-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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.