20,842
20,842 is a composite number, even.
20,842 (twenty thousand eight hundred forty-two) is an even 5-digit number. It is a composite number with 8 divisors, and factors as 2 × 17 × 613. Written other ways, in hexadecimal, 0x516A.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 16
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 24,802
- Recamán's sequence
- a(42,155) = 20,842
- Square (n²)
- 434,388,964
- Cube (n³)
- 9,053,534,787,688
- Divisor count
- 8
- σ(n) — sum of divisors
- 33,156
- φ(n) — Euler's totient
- 9,792
- Sum of prime factors
- 632
Primality
Prime factorization: 2 × 17 × 613
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√20,842 = [144; (2, 1, 2, 1, 1, 2, 1, 2, 1, 5, 2, 2, 2, 1, 10, 2, 1, 1, 31, 2, 16, 2, 31, 1, …)]
Period length 42 — the block in parentheses repeats forever.
Representations
- In words
- twenty thousand eight hundred forty-two
- Ordinal
- 20842nd
- Binary
- 101000101101010
- Octal
- 50552
- Hexadecimal
- 0x516A
- Base64
- UWo=
- One's complement
- 44,693 (16-bit)
- Scientific notation
- 2.0842 × 10⁴
- As a duration
- 20,842 s = 5 hours, 47 minutes, 22 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓂍𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺
- Greek (Milesian)
- ͵κωμβʹ
- Mayan (base 20)
- 𝋢·𝋬·𝋢·𝋢
- Chinese
- 二萬零八百四十二
- Chinese (financial)
- 貳萬零捌佰肆拾貳
Digit at this position in famous constants
- π — Pi (π)
- Digit 20,842 = 9
- e — Euler's number (e)
- Digit 20,842 = 2
- φ — Golden ratio (φ)
- Digit 20,842 = 2
- √2 — Pythagoras's (√2)
- Digit 20,842 = 6
- ln 2 — Natural log of 2
- Digit 20,842 = 9
- γ — Euler-Mascheroni (γ)
- Digit 20,842 = 1
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 20842, here are decompositions:
- 53 + 20789 = 20842
- 71 + 20771 = 20842
- 83 + 20759 = 20842
- 89 + 20753 = 20842
- 149 + 20693 = 20842
- 179 + 20663 = 20842
- 293 + 20549 = 20842
- 359 + 20483 = 20842
Showing the first eight; more decompositions exist.
UTF-8 encoding: E5 85 AA (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.81.106.
- Address
- 0.0.81.106
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.81.106
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 20842 first appears in π at position 105,157 of the decimal expansion (the 105,157ordinal-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
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.