Properties of the Number 19664

Nineteen Thousand Six Hundred Sixty-Four

Basics

Value: 19663 → 19664 → 19665

Parity: even

Prime: No

Previous Prime: 19661

Next Prime: 19681

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ⁴ × 1229

Divisors: 1, 2, 4, 8, 16, 1229, 2458, 4916, 9832, 19664

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110011010000

Octal: 46320

Duodecimal: B468

Hexadecimal: 4cd0

Square: 386672896

Square Root: 140.22838514366484

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

Growth series for group with presentation < S, T : S² = T³ = (S·T)⁷ = 1 >. A298805

a(n) = 3ⁿ - 2·n - 1. A61981

Number of ways to dissect an equilateral triangle into n non-overlapping equilateral triangles counting isomorphisms only once. A299705

Denominators of triangle T(n,k), n>=0, 0<=k<=n, read by rows: T(n,k) is the coefficient of x^2k+1 in polynomial u_n(x), used to approximate x->sin(π*x)/π. A144847

Triangular array: the fission of ((x+2)ⁿ) by (q(n,x)) given by q(n,x)=xⁿ+x^n-1+...+x+1. A193850

Mirror of the triangle A193850. A193851

Number of centered 5-valent trees with n nodes. A36648

The number of partitions of n which represent Chomp positions with Sprague-Grundy value 9. A284782

Numbers whose base-3 representation contains exactly one 0 and no 1's. A44970

Expansion of e.g.f. cosh(sqrt(2)*x) + exp(x)*(cosh(sqrt(2)*x) - 1). A88015