25165820 has 12 divisors (see below), whose sum is σ = 52848264. Its totient is φ = 10066320.

The previous prime is 25165813. The next prime is 25165843. The reversal of 25165820 is 2856152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 629126 + ... + 629165.

It is an arithmetic number, because the mean of its divisors is an integer number (4404022).

Almost surely, 2^25165820 is an apocalyptic number.

25165820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25165820 is an abundant number, since it is smaller than the sum of its proper divisors (27682444).

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

25165820 is a wasteful number, since it uses less digits than its factorization.

25165820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258300 (or 1258298 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 25165820 is about 5016.5545945400. The cubic root of 25165820 is about 293.0468305675.

The spelling of 25165820 in words is "twenty-five million, one hundred sixty-five thousand, eight hundred twenty".