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Properties of the Number -20380

Twenty Thousand Three Hundred Eighty

Basics

Value: -20381 → -20380 → -20379

Parity: even

Prime: No

Previous Prime:

Next Prime: 1

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 2 2 × 5 × 1019

Divisors: 1, 2, 4, 5, 10, 20, 1019, 2038, 4076, 5095

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: -100111110011100

Octal: -47634

Duodecimal: -B964

Hexadecimal: -4f9c

Square: 415344400

Square Root: 142.75853739794337

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 (n+2)X(k+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254189
Maximum number of tatami tilings of any m X m square region with exactly n horizontal dimers and m monomers. A192096
Number of ballot sequences of length n with exactly 4 fixed points. A238979
Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254182
Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254183
Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock diagonal maximum plus antidiagonal median nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A254190
Triangle read by rows: T(p,q) is the number of B-diagrams G such that ω(G)=p half edges and hf(G)=q non-used outer non-cut half edges. A265199
Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,1 3,1 3,2 polyhexes in any orientation on a planar nXnXn triangular grid. A155266