20895 has 16 divisors (see below), whose sum is σ = 38400. Its totient is φ = 9504.

The previous prime is 20887. The next prime is 20897. The reversal of 20895 is 59802.

20895 is nontrivially palindromic in base 14.

It is not a de Polignac number, because 20895 - 2³ = 20887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6 + ... + 204.

It is an arithmetic number, because the mean of its divisors is an integer number (2400).

2²⁰⁸⁹⁵ is an apocalyptic number.

20895 is a deficient number, since it is larger than the sum of its proper divisors (17505).

20895 is a wasteful number, since it uses less digits than its factorization.

20895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 20895 is about 144.5510290520. The cubic root of 20895 is about 27.5431828438.

It can be divided in two parts, 208 and 95, that added together give a palindrome (303).

The spelling of 20895 in words is "twenty thousand, eight hundred ninety-five".