25521920 has 72 divisors (see below), whose sum is σ = 62006784. Its totient is φ = 10063872.

The previous prime is 25521917. The next prime is 25521953. The reversal of 25521920 is 2912552.

It is a self number, because there is not a number n which added to its sum of digits gives 25521920.

It is a congruent number.

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, 162482 + ... + 162638.

Almost surely, 2^25521920 is an apocalyptic number.

25521920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25521920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31003392).

25521920 is an abundant number, since it is smaller than the sum of its proper divisors (36484864).

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

25521920 is a wasteful number, since it uses less digits than its factorization.

25521920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 25521920 is about 5051.9224063717. The cubic root of 25521920 is about 294.4225801836.

The spelling of 25521920 in words is "twenty-five million, five hundred twenty-one thousand, nine hundred twenty".