Properties of the Number 20476

Twenty Thousand Four Hundred Seventy-Six

Basics

Value: 20475 → 20476 → 20477

Parity: even

Prime: No

Previous Prime: 20443

Next Prime: 20477

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5119

Divisors: 1, 2, 4, 5119, 10238, 20476

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111111111100

Octal: 47774

Duodecimal: BA24

Hexadecimal: 4ffc

Square: 419266576

Square Root: 143.09437445266673

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

Number of unimodal maps [1..n]->[0..3]. A223659

a(n) = T(4,n), array T given by A048483. A48487

Number of numbers of complexity n, i.e., that can be built from n ones using + and *, and require at least that many ones. A5421

a(n) = 1 + (6 + (11 + (6 + n)*n)*n)*n/24. A145126

Expansion of (2/(3·sqrt(1-4·z)-1+4·z))*((1-sqrt(1-4·z))/(2·z))^k with k=7. A172064

a(n) = ∑_k=0..n (-1)^k * binomial(3·n-k+1,n-k). A390543

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

Triangle read by rows: T(n,k) = number of configurations of k nonattacking bishops on the black squares of an n X n chessboard (0 <= k <= n - [n>1]). A274105

Start with 1, then alternately add 2 or double. A123208

Sum of cubes of proper divisors of n. A276634