Properties of the Number 20447

Twenty Thousand Four Hundred Forty-Seven

Basics

Value: 20446 → 20447 → 20448

Parity: odd

Prime: No

Previous Prime: 20443

Next Prime: 20477

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 7 × 23 × 127

Divisors: 1, 7, 23, 127, 161, 889, 2921, 20447

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111111011111

Octal: 47737

Duodecimal: B9BB

Hexadecimal: 4fdf

Square: 418079809

Square Root: 142.9930068220121

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

Sum of the smallest parts of the partitions of n into 9 parts. A326465

Odd composite integers m such that A004187(m-J(m,45)) == 0 (mod m) and gcd(m,45)=1, where J(m,45) is the Jacobi symbol. A340099

a(n) = 4·n⁴ + 8·n³ - 4·n - 1 = (2·n² - 1)*(2·n² + 4·n + 1). A57769

Number of partitions of n in which any two parts differ by at most 9. A218511

Row sums of triangle A061312. A193465

Coordination sequence for α-Mn, Position Mn2. A9951

Difference between squares of legs of primitive Pythagorean triangles, sorted (with multiplicity). A127923

Number of dominating subsets of the graph G(n) obtained by joining each vertex of the path graph P_n+1 on n+1 vertices with an additional vertex (the join of K₁ and P_n+1). A213663

Expansion of ( -1-2·x+x²+x³ ) / (x²+x-1)³ . A261055

Lesser of 2 successive sphenic numbers (k, k+4) sandwiching 3 consecutive nonsquarefree numbers. A363830