Properties of the Number 20285

Twenty Thousand Two Hundred Eighty-Five

Basics

Value: 20284 → 20285 → 20286

Parity: odd

Prime: No

Previous Prime: 20269

Next Prime: 20287

Digit Sum: 17

Digital Root: 8

Palindrome: No

Factorization: 5 × 4057

Divisors: 1, 5, 4057, 20285

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111100111101

Octal: 47475

Duodecimal: B8A5

Hexadecimal: 4f3d

Square: 411481225

Square Root: 142.42541907960108

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) = ∑_k=1..n k*σ(k). A143128

Expansion of χ(x) / φ(x²) in powers of·where φ(), χ() are Ramanujan θ functions. A85261

Pseudo-random numbers: gcc 2.6.3 version for 32-bit integers. A84276

Number of partitions p of n such that (number of numbers of the form 3k+1 in p) is a part of p. A241547

Denominators of continued fraction convergents to sqrt(482). A41921

a(n) = 46·n² - 1. A158634

Number of permutations of length n which avoid the patterns 2314, 3241, 4132. A116796

Number of (n+1) X (4+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically. A258550

Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 25. A31613

Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 11. A51976