Properties of the Number 20479

Twenty Thousand Four Hundred Seventy-Nine

Basics

Value: 20478 → 20479 → 20480

Parity: odd

Prime: Yes

Previous Prime: 20477

Next Prime: 20483

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 20479

Divisors: 1, 20479

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111111111111

Octal: 47777

Duodecimal: BA27

Hexadecimal: 4fff

Square: 419389441

Square Root: 143.10485666112103

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

The table of permutations of N, each row induced by the rotation (to the right) of the n-th node in the infinite binary "decimal" fraction tree. A65658

a(n) = 5·2ⁿ - 1. A153894

Primes that divide at least one term of Sylvester's sequence s = A000058: s(n+1) = s(n)² - s(n) + 1, s(0) = 2. A7996

Primes of the form 4^k + 4^m - 1, where k and m are positive integers. A234310

Primes of the form m = 2ⁱ + 2^j - 1, where i > j >= 0. A239712

Luhn primes: primes p such that p + (p reversed) is also a prime. A61783

Number of points of norm <= n in cubic lattice. A605

a(n) = 5·2^n-1 - 1, n>0, with a(0)=1. A52549

Numbers k such that τ(k) = τ(k+1) mod 691, where τ is Ramanujan's τ function A000594. A121733

Numbers of the form i·8^j-1 (i=1..7, j >= 0). A165804