Properties of the Number 28020

Twenty-Eight Thousand Twenty

Basics

Value: 28019 → 28020 → 28021

Parity: even

Prime: No

Previous Prime: 28019

Next Prime: 28027

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 2 ² × 3 × 5 × 467

Divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 110110101110100

Octal: 66564

Duodecimal: 14270

Hexadecimal: 6d74

Square: 785120400

Square Root: 167.39175606940742

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

T(n,k)=Number of length n+5 0..k arrays with no disjoint triples in any consecutive six terms having the same sum. A247995

Number of ways to write n as an ordered sum of 10 squares of positive integers. A340947

a(n) = 2·n*(16·n - 13). A263228

Expansion of 2·x*(6 + 30·x - 13·x² - 70·x³)/((1-x)*(1+2·x)*(1 - 4·x - 3·x² + 10·x³)). A120658

a(n) = 1000·n + 20. A157510

Number of 4-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions. A187299

Number of length n+5 0..5 arrays with no disjoint triples in any consecutive six terms having the same sum. A247992

Number of length 1+5 0..n arrays with no disjoint triples in any consecutive six terms having the same sum. A247996

O.g.f.: exp( ∑_n>=1 (σ(2·n)-σ(n))²/2·xⁿ/n ). A193538

Expansion of 1/((1-2x)(1-8x)(1-11x)(1-12x)). A28020