Properties of the Number 20185

Twenty Thousand One Hundred Eighty-Five

Basics

Value: 20184 → 20185 → 20186

Parity: odd

Prime: No

Previous Prime: 20183

Next Prime: 20201

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 5 × 11 × 367

Divisors: 1, 5, 11, 55, 367, 1835, 4037, 20185

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111011011001

Octal: 47331

Duodecimal: B821

Hexadecimal: 4ed9

Square: 407434225

Square Root: 142.0739244196485

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

Iccanobirt numbers (1 of 15): a(n) = a(n-1) + a(n-2) + R(a(n-3)), where R is the digit reversal function A004086. A102111

Number of points in Z⁴ of norm <= n. A55410

T(n,k)=Number of (n+1)X(k+1) 0..1 arrays x(i,j) with row sums sum{x(i,j), j=1..k+1} nondecreasing, and column sums sum{i²*x(i,j), i=1..n+1} nondecreasing. A233301

a(n) = ∑_{k=0..floor(n/4)} 2^k * binomial(2·n-6·k,2·k). A387623

a(n) = 24·n² + 1. A158547

Irregular triangle read by rows: T(n, k) is the number of chains of subspaces 0 < V₁ < ... < V_r = (F₂)ⁿ, counted up to coordinate permutation, with dimension increments given by (any fixed permutation of) the parts of the k-th partition of n in Abramowitz-Stegun order. A348113

Number of points in Zⁿ of norm <= 8. A55432

a(n) = 841·n + 1. A158404

Number of third differences of arrays of length 5 of numbers in 0..n. A228261

Number of (n+1) X (2+1) 0..1 arrays x(i,j) with row sums ∑_j=1..2+1 x(i,j) nondecreasing, and column sums ∑_i=1..n+1 i²*x(i,j) nondecreasing. A233298