Properties of the Number -20638

Twenty Thousand Six Hundred Thirty-Eight

Basics

Value: -20639 → -20638 → -20637

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 17 × 607

Divisors: 1, 2, 17, 34, 607, 1214, 10319, 20638

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: -101000010011110

Octal: -50236

Duodecimal: -BB3A

Hexadecimal: -509e

Square: 425927044

Square Root: 143.65931922433714

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

Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of e.g.f. B(x)^k, where B(x) is the e.g.f. of A384856. A384860

T(n,k)=Number of nXk 0..2 arrays with exactly floor(nXk/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222488

Maximal elements of pairs of "Super Unitary Amicable Numbers", sorted by their minimal elements. A45614

a(n) = (n⁵ + 145·n⁴ + 905·n³ + 155·n² + 594·n + 120)/120. A143060

Number of nX5 0..2 arrays with exactly floor(nX5/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222485

Growth series for affine Coxeter group (or affine Weyl group) D₉. A266764

a(n) = ∑_{i=0..floor(n/2)} T(2i,n-2i), array T as in A049735. A49738

Number of 5Xn 0..2 arrays with exactly floor(5Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..2 order. A222492