25820660 has 24 divisors (see below), whose sum is σ = 54327840. Its totient is φ = 10308384.

The previous prime is 25820659. The next prime is 25820687. The reversal of 25820660 is 6602852.

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, 13907 + ... + 15653.

It is an arithmetic number, because the mean of its divisors is an integer number (2263660).

Almost surely, 2^25820660 is an apocalyptic number.

25820660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25820660 is an abundant number, since it is smaller than the sum of its proper divisors (28507180).

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

25820660 is a wasteful number, since it uses less digits than its factorization.

25820660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495 (or 2493 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 25820660 is about 5081.4033494695. The cubic root of 25820660 is about 295.5668884878.

The spelling of 25820660 in words is "twenty-five million, eight hundred twenty thousand, six hundred sixty".