Properties of the Number 20722

Twenty Thousand Seven Hundred Twenty-Two

Basics

Value: 20721 → 20722 → 20723

Parity: even

Prime: No

Previous Prime: 20719

Next Prime: 20731

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 × 13 × 797

Divisors: 1, 2, 13, 26, 797, 1594, 10361, 20722

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 101000011110010

Octal: 50362

Duodecimal: BBAA

Hexadecimal: 50f2

Square: 429401284

Square Root: 143.95138068111746

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 that are the sum of eight fourth powers in exactly eight ways. A345840

Numbers k such that the continued fraction for sqrt(k) has period 51. A20390

G.f.: ∑_n>=0 xⁿ * ∏_k=1..n (k + (n-k+1)*x) / (1 + k·x + (n-k+1)*x²). A363110

Number of 231-avoiding stabilized-interval-free permutations of size n. A363432

Number of nX5 0..1 arrays with every element equal to 0, 1, 2 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A302412

a(n) = n + 8. A20722