20388680356931 has 24 divisors (see below), whose sum is σ = 21834708810000. Its totient is φ = 19033646436864.

The previous prime is 20388680356927. The next prime is 20388680356937. The reversal of 20388680356931 is 13965308688302.

It is not a de Polignac number, because 20388680356931 - 2² = 20388680356927 is a prime.

It is a super-2 number, since 2×20388680356931² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20388680356937) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30196340 + ... + 30864158.

It is an arithmetic number, because the mean of its divisors is an integer number (909779533750).

Almost surely, 2^{20388680356931} is an apocalyptic number.

20388680356931 is a deficient number, since it is larger than the sum of its proper divisors (1446028453069).

20388680356931 is a wasteful number, since it uses less digits than its factorization.

20388680356931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668711 (or 668694 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 62.

The spelling of 20388680356931 in words is "twenty trillion, three hundred eighty-eight billion, six hundred eighty million, three hundred fifty-six thousand, nine hundred thirty-one".