Properties of the Number 19880

Nineteen Thousand Eight Hundred Eighty

Basics

Value: 19879 → 19880 → 19881

Parity: even

Prime: No

Previous Prime: 19867

Next Prime: 19889

Digit Sum: 26

Digital Root: 8

Palindrome: No

Factorization: 2 ³ × 5 × 7 × 71

Divisors: 1, 2, 4, 5, 7, 8, 10, 14, 20, 28

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100110110101000

Octal: 46650

Duodecimal: B608

Hexadecimal: 4da8

Square: 395214400

Square Root: 140.99645385611655

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

Number of regions into which a figure made up of a row of n adjacent congruent rectangles is divided upon drawing diagonals of all possible rectangles (a(0)=0 by convention). A306302

T(n,k)=Number of (n+2)X(k+2) binary arrays avoiding patterns 000 and 111 in rows, columns and nw-to-se diagonals. A202647

Numbers that are the sum of four third powers in six or more ways. A345148

Numbers that are the sum of four third powers in exactly six ways. A345149

a(1) = 1, then multiply, subtract, and add 2, 3, 4; 5, 6, 7; ... in that order. A362272

a(1)=a(2)=0; thereafter a(n) = a(n-2)+A238828(n-1)+A238827(n). A238830

Numbers m such that the GCD of the x's that satisfy σ(x) = m is 3. A241648

Sum of the largest parts of the partitions of n into 5 parts. A308827

Triangle read by rows: S_B(n,k) = "Type B" Stirling numbers of the second kind. A85483

Numbers k such that A011772(k) > A344878(k) and A011772(k) is a divisor of A344875(k). A344595