20311925 has 6 divisors (see below), whose sum is σ = 25186818. Its totient is φ = 16249520.

The previous prime is 20311903. The next prime is 20311937. The reversal of 20311925 is 52911302.

It can be written as a sum of positive squares in 3 ways, for example, as 6754801 + 13557124 = 2599^2 + 3682^2 .

It is not a de Polignac number, because 20311925 - 2¹⁶ = 20246389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20311925.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406214 + ... + 406263.

It is an arithmetic number, because the mean of its divisors is an integer number (4197803).

Almost surely, 2^20311925 is an apocalyptic number.

20311925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20311925 is a deficient number, since it is larger than the sum of its proper divisors (4874893).

20311925 is an equidigital number, since it uses as much as digits as its factorization.

20311925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812487 (or 812482 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 20311925 is about 4506.8753033560. The cubic root of 20311925 is about 272.8456461732.

The spelling of 20311925 in words is "twenty million, three hundred eleven thousand, nine hundred twenty-five".