Properties of the Number 20440

Twenty Thousand Four Hundred Forty

Basics

Value: 20439 → 20440 → 20441

Parity: even

Prime: No

Previous Prime: 20431

Next Prime: 20441

Digit Sum: 10

Digital Root: 1

Palindrome: No

Factorization: 2 ³ × 5 × 7 × 73

Divisors: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111111011000

Octal: 47730

Duodecimal: B9B4

Hexadecimal: 4fd8

Square: 417793600

Square Root: 142.96852800529214

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

sigma₃(n): sum of cubes of divisors of n. A1158

a(n) = ∑_{k divides n} (n/k)^k. A55225

Fourier coefficients of E_infinity,4. A7331

a(n) = n³ + n² + n + 1. A53698

Sum of cubes of odd divisors of n. A51000

Numbers n such that σ(φ(n)) = n. A18784

a(n) = ∑_{d >= 1, d divides n} (-1)^n-d*d³. A8457

a(n) = sigma₃(2·n+1). A45823

a(n) = ∑_{d divides n} (-1)^n/d+1*d³. A78307

Triangle read by rows, S₃(n, k) where S_m(n, k) are the Stirling-Frobenius subset numbers of order m; n >= 0, k >= 0. A225468