Properties of the Number 20439

Twenty Thousand Four Hundred Thirty-Nine

Basics

Value: 20438 → 20439 → 20440

Parity: odd

Prime: No

Previous Prime: 20431

Next Prime: 20441

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 3 ³ × 757

Divisors: 1, 3, 9, 27, 757, 2271, 6813, 20439

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111111010111

Octal: 47727

Duodecimal: B9B3

Hexadecimal: 4fd7

Square: 417752721

Square Root: 142.96503068932626

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

First differences of A006128. A138137

Numbers m such that m divides 10^m - 1. A14950

a(n) = n³ + n² + n. A27444

Sum of the cubes of the divisor complements of the odd proper divisors of n. A352049

a(n) = n³ + 3·n + 3ⁿ. A220509

Smallest solution to 10^m == 1 (mod m) having the prime divisor A066364(n). A114207

Numbers k such that k and 4·k, taken together, are pandigital. A115924

Column 4 of triangle A123610. A123614

a(0) = 6, a(1) = 17, a(n+1) = a(n) + a(n-1) for n>0. A166025

a(n) = 5·2^n-1 - 2 - 3·n. A213387