Properties of the Number 20515

Twenty Thousand Five Hundred Fifteen

Basics

Value: 20514 → 20515 → 20516

Parity: odd

Prime: No

Previous Prime: 20509

Next Prime: 20521

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 5 × 11 × 373

Divisors: 1, 5, 11, 55, 373, 1865, 4103, 20515

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101000000100011

Octal: 50043

Duodecimal: BA57

Hexadecimal: 5023

Square: 420865225

Square Root: 143.23058332632735

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 6th powers: 0⁶ + 1⁶ + 2⁶ + ... + n⁶. A540

Numbers n such that n!! - 2 is prime. A94144

a(n) = 1ⁿ + 2ⁿ + ... + 5ⁿ. A1552

a(n) = ∑_k=1..n-1 kⁿ. A121706

Triangle T(n,k) = sum of the k first n-th powers. A215083

Sum of distinct nonzero sixth powers. A194769

Total number of smallest parts that are also emergent parts in all partitions of n. A220479

Numbers with 3 prime factors a < b < c such that 2c = a⁴ + b². A261657

Denominator of L(n) = (∑_k=1..n kⁿ)/(∑_k=1..n-1 kⁿ). A43300

Numbers which are the sums of consecutive sixth powers. A217846