Properties of the Number 20718

Twenty Thousand Seven Hundred Eighteen

Basics

Value: 20717 → 20718 → 20719

Parity: even

Prime: No

Previous Prime: 20717

Next Prime: 20719

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 × 3 ² × 1151

Divisors: 1, 2, 3, 6, 9, 18, 1151, 2302, 3453, 6906

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000011101110

Octal: 50356

Duodecimal: BBA6

Hexadecimal: 50ee

Square: 429235524

Square Root: 143.93748643074187

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 T(n,k) of solid standard Young tableaux of n cells and height = k; triangle T(n,k), n>=0, 0<=k<=n, read by rows. A214753

G.f. satisfies: A(x) = ∑_n>=0 xⁿ*A(x)^6·n². A191804

Numbers n such that for some m, A166133(m)=n, A166133(m+1)=n²-1, in increasing order. A256407

a(n) is the number of regions formed by n-secting the angles of a nonagon (enneagon). A335781

Expansion of ∑_i>=0 x^2ⁱ/(1 - x^2ⁱ) / ∏_j>=0 (1 - x^{2^j}). A281688

Numbers k such that 5·10^k - 7 is prime. A103002

a(n) = 64·n² - n. A157948

a(n) = 256·n² - 2·n. A158249

Index of the first occurrence of prime(n) in A060324. A78454

a(n) = digit reversal of A103741(n). A103763