Properties of the Number 20145

Twenty Thousand One Hundred Forty-Five

Basics

Value: 20144 → 20145 → 20146

Parity: odd

Prime: No

Previous Prime: 20143

Next Prime: 20147

Digit Sum: 12

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 17 × 79

Divisors: 1, 3, 5, 15, 17, 51, 79, 85, 237, 255

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

4823 Try Today's Challenge

Representations

Binary: 100111010110001

Octal: 47261

Duodecimal: B7A9

Hexadecimal: 4eb1

Square: 405821025

Square Root: 141.93308282426617

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

Numbers k such that k and k+1 have same sum of divisors. A2961

Numbers k such that k and k+1 have the same sum of unitary divisors (A034448). A64125

Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999). A293183

Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417). A306985

Numbers k such that σ(k+1) divides σ(k), where σ(k) is the sum of positive divisors of k. A58073

Numbers k such that σ(k) divides σ(k+1), where σ(k) is sum of positive divisors of k. A58072

Lexicographically earliest sequence of positive integers with the property that a(a(n)) = a(1)+a(2)+...+a(n). A105753

a(n) = Re([n]_{1+i}!), where [n]_q! is the q-factorial, i = sqrt(-1). A275706

Numbers k such that k and k+1 have the same sum but an unequal number of divisors. A54007

Sum of the odd singletons in all partitions of n (n>=0). A singleton in a partition is a part that occurs exactly once. A276423