Properties of the Number 20504

Twenty Thousand Five Hundred Four

Basics

Value: 20503 → 20504 → 20505

Parity: even

Prime: No

Previous Prime: 20483

Next Prime: 20507

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ³ × 11 × 233

Divisors: 1, 2, 4, 8, 11, 22, 44, 88, 233, 466

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000000011000

Octal: 50030

Duodecimal: BA48

Hexadecimal: 5018

Square: 420414016

Square Root: 143.19217855735

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

a(n) = ∑_{1 <= i < j <= n} F(i)*F(j), where F(k) is the k-th Fibonacci number. A190173

Numerators of "Farey fraction" approximations to e. A119014

Number of ways to tile a 5 X 2n room with 1x2 Tatami mats. At most 3 Tatami mats may meet at a point. A68924

Transform of 1 by the T_1,1 transformation (see link). A159328

E.g.f.: A(x) + B(x) + C(x) where A'(x) = B(x)*C(x), B'(x) = A(x)*C(x), and C'(x) = A(x)*B(x), where A(x), B(x), and C(x) are the e.g.f.s of A292121, A292122, and A292123, respectively. A292120

Number of integer partitions of n whose multiplicities have multiplicities that cover an initial interval of positive integers. A325330

Numerators of approximations to e. A6258

Triangle read by rows: Number T(n,k) of 2-colored binary rooted trees with n nodes and exactly k <= n nodes of a specific color. A241555

Numbers with digit sum 11 that are multiples of 11. A283742

The number of edges on a vesica piscis formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. A342152