Properties of the Number 20395

Twenty Thousand Three Hundred Ninety-Five

Basics

Value: 20394 → 20395 → 20396

Parity: odd

Prime: No

Previous Prime: 20393

Next Prime: 20399

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 5 × 4079

Divisors: 1, 5, 4079, 20395

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 100111110101011

Octal: 47653

Duodecimal: B977

Hexadecimal: 4fab

Square: 415956025

Square Root: 142.81106399715674

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) = least k such that the remainder when 12^k is divided by k is n. A127820

Least k such that n^k mod k = n + 1. A128172

Number of partitions p = [x(1), ..., x(k)], where x(1) >= x(2) >= ... >= x(k), of n such that max(x(i) - x(i-1)) <= number of distinct parts of p. A241819

Denominators of convergents to the Thue-Morse constant 0.41245403364... A85395

a(n) = ∑_k=2..n binomial(k,2) * floor(n/k). A366967

Semiprimes (A001358) whose digit reversal is a pentagonal number (A000326). A115708

Number of n-ary words beginning with the first character of the alphabet, that can be built by inserting four doublets into the initially empty word. A194716

Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 817", based on the 5-celled von Neumann neighborhood. A273648

Subminimal numbers, from minimal numbers by analogy with subfactorials. A79717

a(n) = ∑_k=1..n binomial(2·n, k) * σ(k). A356341

We use cookies

Some cookies are essential for Natory to function, like keeping you signed in. We also use optional cookies to understand how the app is used and improve it over time. Learn more in our Privacy Policy. You can manage your preferences anytime.