20125931 has 4 divisors (see below), whose sum is σ = 23001072. Its totient is φ = 17250792.

The previous prime is 20125907. The next prime is 20125979. The reversal of 20125931 is 13952102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13952102 = 2 ⋅6976051.

It is a cyclic number.

It is not a de Polignac number, because 20125931 - 2⁶ = 20125867 is a prime.

It is a super-2 number, since 2×20125931² = 810106197233522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20125897 and 20125906.

It is not an unprimeable number, because it can be changed into a prime (20125991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437560 + ... + 1437573.

It is an arithmetic number, because the mean of its divisors is an integer number (5750268).

Almost surely, 2^20125931 is an apocalyptic number.

20125931 is a deficient number, since it is larger than the sum of its proper divisors (2875141).

20125931 is an equidigital number, since it uses as much as digits as its factorization.

20125931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2875140.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20125931 is about 4486.1933752347. The cubic root of 20125931 is about 272.0102856188.

The spelling of 20125931 in words is "twenty million, one hundred twenty-five thousand, nine hundred thirty-one".