25663920 has 80 divisors (see below), whose sum is σ = 80908512. Its totient is φ = 6727680.

The previous prime is 25663901. The next prime is 25663933. The reversal of 25663920 is 2936652.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13764 + ... + 15516.

Almost surely, 2^25663920 is an apocalyptic number.

25663920 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 25663920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40454256).

25663920 is an abundant number, since it is smaller than the sum of its proper divisors (55244592).

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

25663920 is a wasteful number, since it uses less digits than its factorization.

25663920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830 (or 1824 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 25663920 is about 5065.9569678393. The cubic root of 25663920 is about 294.9676111142.

The spelling of 25663920 in words is "twenty-five million, six hundred sixty-three thousand, nine hundred twenty".