Properties of the Number 20188

Twenty Thousand One Hundred Eighty-Eight

Basics

Value: 20187 → 20188 → 20189

Parity: even

Prime: No

Previous Prime: 20183

Next Prime: 20201

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 ² × 7 ² × 103

Divisors: 1, 2, 4, 7, 14, 28, 49, 98, 103, 196

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100111011011100

Octal: 47334

Duodecimal: B824

Hexadecimal: 4edc

Square: 407555344

Square Root: 142.08448191129108

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

a(n) = minimal positive k such that the concatenation of the decimal digits of n,n+1,...,n+k is divisible by n+k+1, or -1 if no such k exists. A332580

Partial sums of A001158: ∑_j=1..n sigma₃(j). A64603

Numbers k such that k and k + 1 are both lazy-Lucas-Niven numbers (A351719). A351720

T(n,k) = Number of n X k 0..1 arrays with every element equal to 0, 1, 2, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. A303182

Greatest number m such that the fractional part of (π-2)^A153719(m) >= 1-(1/m). A153723

Greatest number m such that the fractional part of (π-2)^A153720(n) >= 1-(1/m). A153724

a(n) appears in the congruences modulo 4 or 32 of Markoff numbers m(n) = A002559(n) for odd or even m(n). A309376

Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 2 and repeat; as m = 1,2,3,.. the remaining terms form this sequence. A112560

Number of peaks at odd level in all Dyck paths of semilength n with no UUU's and no DDD's, (U=(1,1), D=(1,-1)). These Dyck paths are counted by the secondary structure numbers (A004148). A166292

Gaps of 2 in sequence A038593 (upper terms). A38644