20125 has 16 divisors (see below), whose sum is σ = 29952. Its totient is φ = 13200.

The previous prime is 20123. The next prime is 20129. The reversal of 20125 is 52102.

It is not a de Polignac number, because 20125 - 2¹ = 20123 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123) 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, 864 + ... + 886.

It is an arithmetic number, because the mean of its divisors is an integer number (1872).

2²⁰¹²⁵ is an apocalyptic number.

20125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20125 is a deficient number, since it is larger than the sum of its proper divisors (9827).

20125 is an equidigital number, since it uses as much as digits as its factorization.

20125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45 (or 35 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20125 is about 141.8626095911. The cubic root of 20125 is about 27.2006091271.

Adding to 20125 its reverse (52102), we get a palindrome (72227).

It can be divided in two parts, 20 and 125, that multiplied together give a square (2500 = 50²).

The spelling of 20125 in words is "twenty thousand, one hundred twenty-five".