Properties of the Number 81020

Eighty-One Thousand Twenty

Basics

Value: 81019 → 81020 → 81021

Parity: even

Prime: No

Previous Prime: 81019

Next Prime: 81023

Digit Sum: 11

Digital Root: 2

Palindrome: No

Factorization: 2 ² × 5 × 4051

Divisors: 1, 2, 4, 5, 10, 20, 4051, 8102, 16204, 20255

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10011110001111100

Octal: 236174

Duodecimal: 3AA78

Hexadecimal: 13c7c

Square: 6564240400

Square Root: 284.6401236649535

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

Indices of primes in sequence defined by A(0) = 37, A(n) = 10·A(n-1) - 63 for n > 0. A101824

Even order Taylor coefficients at x = 0 of exp(-x²/(x²-2)), odd order coefficients being equal to zero. A81020