20125939 has 4 divisors (see below), whose sum is σ = 20146456. Its totient is φ = 20105424.

The previous prime is 20125907. The next prime is 20125979. The reversal of 20125939 is 93952102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20125939 - 2⁵ = 20125907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20125939.

It is not an unprimeable number, because it can be changed into a prime (20125979) 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, 8709 + ... + 10774.

It is an arithmetic number, because the mean of its divisors is an integer number (5036614).

Almost surely, 2^20125939 is an apocalyptic number.

20125939 is a deficient number, since it is larger than the sum of its proper divisors (20517).

20125939 is a wasteful number, since it uses less digits than its factorization.

20125939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20516.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 20125939 is about 4486.1942668592. The cubic root of 20125939 is about 272.0103216599.

The spelling of 20125939 in words is "twenty million, one hundred twenty-five thousand, nine hundred thirty-nine".