Properties of the Number 22820

Twenty-Two Thousand Eight Hundred Twenty

Basics

Value: 22819 → 22820 → 22821

Parity: even

Prime: No

Previous Prime: 22817

Next Prime: 22853

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 5 × 7 × 163

Divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101100100100100

Octal: 54444

Duodecimal: 11258

Hexadecimal: 5924

Square: 520752400

Square Root: 151.06290080625354

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

Hexagonal prism numbers: a(n) = (n + 1)*(3·n² + 3·n + 1). A5915

Number of ways to place 2 nonattacking nightriders on an n X n board. A172141

θ series of A2[hole]⁴. A33690

a(n) = n*(n + 1)*(17·n - 14)/6. A237617

Integers k such that 10^k + 67 is a prime number. A135113

Number of steps before n1(i) = n2(i) when n1(i) = n1(i-1) + digsum(n2(i-1)), n2(i) = n2(i-1) + digsum(n1(i-1)) and n1(1) = 10^n-1, n2(1) = 0. A272233

a(n) = a(1) + a(2) + ... + a(n-1) + a(m) for n >= 4, where m = 2·n - 3 - 2^p+1 and p is the unique integer such that 2^p < n - 1 <= 2^p+1, starting with a(1) = a(2) = a(3) = 1. A49932

Number of positive integers <= 2ⁿ of form 3 x² + 8 y². A54165

Values of·in A216363. A216382

Number of distinct ways to erect n semicircles of distinct diameters in [n] on the number line from 1 to 2n using 2 colors where all semicircles of the same color are mutually noncrossing. Two ways are regarded the same if the number line is reversed or the colors are exchanged. A375254