25131920 has 40 divisors (see below), whose sum is σ = 63745920. Its totient is φ = 9138560.

The previous prime is 25131919. The next prime is 25131937. The reversal of 25131920 is 2913152.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×25131920² = 1263226805772800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13400 + ... + 15159.

It is an arithmetic number, because the mean of its divisors is an integer number (1593648).

Almost surely, 2^25131920 is an apocalyptic number.

25131920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25131920 is an abundant number, since it is smaller than the sum of its proper divisors (38614000).

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

25131920 is a wasteful number, since it uses less digits than its factorization.

25131920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28583 (or 28577 counting only the distinct ones).

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

The square root of 25131920 is about 5013.1746428785. The cubic root of 25131920 is about 292.9151870445.

The spelling of 25131920 in words is "twenty-five million, one hundred thirty-one thousand, nine hundred twenty".