25391920 has 20 divisors (see below), whose sum is σ = 59036400. Its totient is φ = 10156736.

The previous prime is 25391909. The next prime is 25391963. The reversal of 25391920 is 2919352.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158620 + ... + 158779.

It is an arithmetic number, because the mean of its divisors is an integer number (2951820).

Almost surely, 2^25391920 is an apocalyptic number.

25391920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25391920 is an abundant number, since it is smaller than the sum of its proper divisors (33644480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25391920 is a wasteful number, since it uses less digits than its factorization.

25391920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317412 (or 317406 counting only the distinct ones).

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

The square root of 25391920 is about 5039.0395910332. The cubic root of 25391920 is about 293.9218327678.

The spelling of 25391920 in words is "twenty-five million, three hundred ninety-one thousand, nine hundred twenty".