Properties of the Number 20428

Twenty Thousand Four Hundred Twenty-Eight

Basics

Value: 20427 → 20428 → 20429

Parity: even

Prime: No

Previous Prime: 20411

Next Prime: 20431

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ² × 5107

Divisors: 1, 2, 4, 5107, 10214, 20428

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 100111111001100

Octal: 47714

Duodecimal: B9A4

Hexadecimal: 4fcc

Square: 417303184

Square Root: 142.92655456562298

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

Number of odd prime powers (A246655) between 2ⁿ and 2ⁿ⁺¹. A244508

Binomial transform of [1, 1, 5, 5, 5, ...]. A131064

Least k > 1 such that kⁿ is a twin rank (cf. A002822: 6·kⁿ +- 1 are twin primes). A326230

Coordination sequence for α-Mn, Position Mn1. A9950

The Wiener index of the graph \|/_\/_\/_..._\/_\|/ having n nodes on the horizontal path. A180571

Number of cyclic arrangements of {1..n} such that any three neighbors satisfy the triangle inequality. A338564

Number of partitions of n such that 4*(least part) <= greatest part. A363276

Numbers k such that the continued fraction for sqrt(k) has period 89. A20428