20388025925 has 12 divisors (see below), whose sum is σ = 25897766916. Its totient is φ = 15912604800.

The previous prime is 20388025921. The next prime is 20388025937. The reversal of 20388025925 is 52952088302.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7724124769 + 12663901156 = 87887^2 + 112534^2 .

It is not a de Polignac number, because 20388025925 - 2² = 20388025921 is a prime.

It is a super-2 number, since 2×20388025925² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20388025921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9944354 + ... + 9946403.

It is an arithmetic number, because the mean of its divisors is an integer number (2158147243).

Almost surely, 2^20388025925 is an apocalyptic number.

20388025925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20388025925 is a deficient number, since it is larger than the sum of its proper divisors (5509740991).

20388025925 is a wasteful number, since it uses less digits than its factorization.

20388025925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19890808 (or 19890803 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 20388025925 in words is "twenty billion, three hundred eighty-eight million, twenty-five thousand, nine hundred twenty-five".