Properties of the Number 20360

Twenty Thousand Three Hundred Sixty

Basics

Value: 20359 → 20360 → 20361

Parity: even

Prime: No

Previous Prime: 20359

Next Prime: 20369

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 5 × 509

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 509, 1018

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100111110001000

Octal: 47610

Duodecimal: B948

Hexadecimal: 4f88

Square: 414529600

Square Root: 142.68847185389575

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

Table read by rows: T(n,k) = number of k-gons, k >= 3, formed inside a square with edge length 1 by the straight line segments mutually connecting all vertices and points that divide the sides into segments with lengths equal to the Farey series of order n = A006842(n,m)/A006843(n,m), m = 1..A005728(n). A358889

Numbers k such that 7·10^k + 1 is prime. A56804

Pascal-like triangle, where each entry is the sum of the four entries above it starting with 1 at the top. A356692

a(n) = ∑_{-n<i<n, -n<j<n, gcd{i,j}=2} (n-|i|)*(n-|j|). A331772

Triangle read by rows: T(n,k) is the number of Dyck paths with no UUU's and no DDD's, of semilength n having k peak plateaux (0 <= k <= floor(n/3); U=(1,1), D=(1,-1)). A166285

Triangle read by rows: number of generic n-rook placements with k rooks below the main diagonal. A269744

Nonsquarefree numbers k such that A276086(A003415(k)) <= k, where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function. A392873

Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 71. A31569

Numbers k such that the continued fraction for sqrt(k) has period 21. A20360