20331925 has 6 divisors (see below), whose sum is σ = 25211618. Its totient is φ = 16265520.

The previous prime is 20331917. The next prime is 20331953. The reversal of 20331925 is 52913302.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 27889 + 20304036 = 167^2 + 4506^2 .

It is not a de Polignac number, because 20331925 - 2³ = 20331917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 813277 = 20331925 / (2 + 0 + 3 + 3 + 1 + 9 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20331925.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406614 + ... + 406663.

Almost surely, 2^20331925 is an apocalyptic number.

20331925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20331925 is a deficient number, since it is larger than the sum of its proper divisors (4879693).

20331925 is an equidigital number, since it uses as much as digits as its factorization.

20331925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813287 (or 813282 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 20331925 is about 4509.0935896253. The cubic root of 20331925 is about 272.9351686723.

The spelling of 20331925 in words is "twenty million, three hundred thirty-one thousand, nine hundred twenty-five".