20641925 has 12 divisors (see below), whose sum is σ = 26709600. Its totient is φ = 15795120.

The previous prime is 20641913. The next prime is 20641931. The reversal of 20641925 is 52914602.

It is a happy number.

It is not a de Polignac number, because 20641925 - 2⁴ = 20641909 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 17375 + ... + 18524.

It is an arithmetic number, because the mean of its divisors is an integer number (2225800).

Almost surely, 2^20641925 is an apocalyptic number.

20641925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20641925 is a deficient number, since it is larger than the sum of its proper divisors (6067675).

20641925 is a wasteful number, since it uses less digits than its factorization.

20641925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35932 (or 35927 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 20641925 is about 4543.3385302000. The cubic root of 20641925 is about 274.3153215369.

The spelling of 20641925 in words is "twenty million, six hundred forty-one thousand, nine hundred twenty-five".