Properties of the Number 20478

Twenty Thousand Four Hundred Seventy-Eight

Basics

Value: 20477 → 20478 → 20479

Parity: even

Prime: No

Previous Prime: 20477

Next Prime: 20479

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 3413

Divisors: 1, 2, 3, 6, 3413, 6826, 10239, 20478

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100111111111110

Octal: 47776

Duodecimal: BA26

Hexadecimal: 4ffe

Square: 419348484

Square Root: 143.1013626769501

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

a(n) = 5·2ⁿ - 2. A51633

a(n) = 5·2^n-2 - 2 for n > 1, with a(1) = 1. A131051

Initial members of abundant quadruplets, i.e., values of k such that (k, k+2, k+4, k+6) are all abundant numbers. A231089

Start with 1, then alternately add 2 or double. A123208

Expansion of ∏_k>=1 1/((1 - x^k²)*(1 - x^k)). A369520

a(n) = 1² + prime(1)² + prime(2)² + ... + prime(n)². A24525

Number of primes between successive Lucas numbers. A52012

Indices of primes in the 7th-order Fibonacci number sequence, A060455. A253318

Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 502", based on the 5-celled von Neumann neighborhood. A282684

Numbers n such that n¹⁰²⁴ + (n+1)¹⁰²⁴ is prime. A274234