Properties of the Number 20874

Twenty Thousand Eight Hundred Seventy-Four

Basics

Value: 20873 → 20874 → 20875

Parity: even

Prime: No

Previous Prime: 20873

Next Prime: 20879

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 7 ² × 71

Divisors: 1, 2, 3, 6, 7, 14, 21, 42, 49, 71

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 101000110001010

Octal: 50612

Duodecimal: 100B6

Hexadecimal: 518a

Square: 435723876

Square Root: 144.47837208385207

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

Triangle T(n,k) = total of number at last index for all set partitions of n into k parts. A120095

a(n) = ∑_k=0..n φ(k² + 1), where φ is the Euler totient function (A000010). A333170

Number of directed rooted trees on n nodes with forbidden limbs. A14276

Values of Newton-Gregory forward interpolating polynomial (1/3)*(2·n-7)*(2·n²-11·n+18). A30434

Values of Newton-Gregory forward interpolating polynomial (1/3)*(2·n - 3)*(2·n² - 3·n + 4). A30441

a(n) = (5·n+2)*(5·n+7). A85036

A007318·A000203. A131046

a(n) = ∑_i=1..n binomial(i+5,6)². A86027

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally. A253495

Number of paths in Moebius ladder M_n. A20874