Properties of the Number 20129

Twenty Thousand One Hundred Twenty-Nine

Basics

Value: 20128 → 20129 → 20130

Parity: odd

Prime: Yes

Previous Prime: 20123

Next Prime: 20143

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 20129

Divisors: 1, 20129

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 100111010100001

Octal: 47241

Duodecimal: B795

Hexadecimal: 4ea1

Square: 405176641

Square Root: 141.8767070381886

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

Growth series for affine Coxeter group B₄. A267167

T(n,k)=Number of nXk 0..1 arrays avoiding 0 1 0 horizontally and 1 0 0 vertically. A206889

T(n,k)=Number of nXk binary arrays without the pattern 0 0 1 vertically or horizontally. A188763

Primes p of the form 4·k+1 for which s=26 is the least positive integer such that s·p-(floor(sqrt(s·p)))² is a square. A145050

Primes that remain prime through 3 iterations of function f(x) = 5x + 4. A23284

Base 4 expansion of 1/n has equal percentage of each digit 0,1,2,3. A74709

a(n) = ∑_{k=0..floor(n/7)} binomial(n,7·k). A306852

A014486-indices of A083932-trees. A83934

Primes congruent to 60 mod 61. A142858

Sequence of primes separated by [sequence of prime] elements. 2, [find 2nd prime after 2 = ] 5, [find 3rd prime after 5 =] 13, [find 5th prime after 13 =] 61, ..., etc. A180302