Properties of the Number 20404

Twenty Thousand Four Hundred Four

Basics

Value: 20403 → 20404 → 20405

Parity: even

Prime: No

Previous Prime: 20399

Next Prime: 20407

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 5101

Divisors: 1, 2, 4, 5101, 10202, 20404

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 100111110110100

Octal: 47664

Duodecimal: B984

Hexadecimal: 4fb4

Square: 416323216

Square Root: 142.84257068535277

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

Numbers n such that there is no square n-gonal number greater than 1. A188896

T(n,k) is the number of (n+1) X (k+1) 0..6 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 1, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings). A234898

Number of partitions p of n such that (maximal multiplicity of the parts of p) > (number of distinct parts of p). A240309

Number of binary strings of length 2n having exactly 1 factorization as a concatenation of one or more even-length palindromes. A241208

Expansion of ∏_k>=1 (1 + x^k)^k*(k+1*(2·k-1)/2). A294845

Number of words of length n over an alphabet of size 4 that are not "bifix-free". A94559

Least number k >= 0 such that (n!+k)/(n+k) is an integer. A242567

A hierarchical sequence (S(W2{2}c) - see A059126). A59133

A094559/4. A94578

a(n) = A113572(n)/n. A113573