Properties of the Number 17920

Seventeen Thousand Nine Hundred Twenty

Basics

Value: 17919 → 17920 → 17921

Parity: even

Prime: No

Previous Prime: 17911

Next Prime: 17921

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ⁹ × 5 × 7

Divisors: 1, 2, 4, 5, 7, 8, 10, 14, 16, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100011000000000

Octal: 43000

Duodecimal: A454

Hexadecimal: 4600

Square: 321126400

Square Root: 133.8656042454521

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

11-almost primes (generalization of semiprimes). A69272

Triangle read by rows: terms T(n,k) of a binomial decomposition of n*(-1)ⁿ as Sum(k=0..n)T(n,k). A244141

Triangle of idempotent numbers binomial(n,k)*k^n-k, version 1. A59297

Scaled Chebyshev U-polynomials evaluated at sqrt(2). A57084

Triangle whose (i,j)-th entry is binomial(i,j)*4^i-j. A38231

Triangle whose (i,j)-th entry is binomial(i,j)*2ⁱ. A38208

5-fold convolution of A000302 (powers of 4); expansion of 1/(1-4·x)⁵. A40075

a(n) = 4ⁿ*(2·n)!/(n!)². A98430

Triangle read by rows: T(n, k) is the number of labeled trees on n nodes with maximal node degree k (0 < k < n). A61356

Triangular array of the coefficients of the sequence of Abel polynomials A(n,x) := x*(x-n)^n-1. A137452