Properties of the Number 15520

Fifteen Thousand Five Hundred Twenty

Basics

Value: 15519 → 15520 → 15521

Parity: even

Prime: No

Previous Prime: 15511

Next Prime: 15527

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 ⁵ × 5 × 97

Divisors: 1, 2, 4, 5, 8, 10, 16, 20, 32, 40

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 11110010100000

Octal: 36240

Duodecimal: 8B94

Hexadecimal: 3ca0

Square: 240870400

Square Root: 124.57929201917949

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) is the number of (n+1) X (k+1) 0..4 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant-stress 1 X 1 tilings). A235280

Array read by antidiagonals: Solutions to Schmidt's Problem. A94424

5-untouchable numbers. A284187

a(n) = 2·6ⁿ - 2ⁿ. A81656

Greater of a,b where n² = a³ + b³; a,b>0 and gcd(a,b)=1. The lesser of a,b is the corresponding term in A099532 and n, which is used to order this sequence, is the corresponding term in A099426. A99533

Indices i where a run of nonzero values starts in A305671. A305672

O.g.f.: exp( ∑_n>=1 (σ(2n)-σ(n))² * xⁿ/n ). A177398

Greater value of a coprime pair (x,y) satisfying x³+y³=z². A282639

Number of rooted identity trees with n internal (non-leaf) nodes. A108530

Number of tilings of a 20 X n rectangle using 2n decominoes of shape I. A250667