20665925 has 24 divisors (see below), whose sum is σ = 29462400. Its totient is φ = 14086080.

The previous prime is 20665907. The next prime is 20665961. The reversal of 20665925 is 52956602.

It is not a de Polignac number, because 20665925 - 2⁸ = 20665669 is a prime.

It is a super-2 number, since 2×20665925² = 854160912211250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46856 + ... + 47294.

It is an arithmetic number, because the mean of its divisors is an integer number (1227600).

Almost surely, 2^20665925 is an apocalyptic number.

20665925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20665925 is a deficient number, since it is larger than the sum of its proper divisors (8796475).

20665925 is a wasteful number, since it uses less digits than its factorization.

20665925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 720 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 20665925 is about 4545.9789924724. The cubic root of 20665925 is about 274.4215942130.

The spelling of 20665925 in words is "twenty million, six hundred sixty-five thousand, nine hundred twenty-five".