20925 has 24 divisors (see below), whose sum is σ = 39680. Its totient is φ = 10800.

The previous prime is 20921. The next prime is 20929. The reversal of 20925 is 52902.

20925 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (20921) and next prime (20929).

It is not a de Polignac number, because 20925 - 2² = 20921 is a prime.

20925 is strictly pandigital in base 6.

It is a Curzon number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 20898 and 20907.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20925.

It is not an unprimeable number, because it can be changed into a prime (20921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 660 + ... + 690.

2²⁰⁹²⁵ is an apocalyptic number.

20925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20925 is a deficient number, since it is larger than the sum of its proper divisors (18755).

20925 is a wasteful number, since it uses less digits than its factorization.

20925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 39 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 20925 is about 144.6547614149. The cubic root of 20925 is about 27.5563582502.

It can be divided in two parts, 209 and 25, that multiplied together give a palindrome (5225).

The spelling of 20925 in words is "twenty thousand, nine hundred twenty-five".