20103997931 has 2 divisors, whose sum is σ = 20103997932. Its totient is φ = 20103997930.

The previous prime is 20103997919. The next prime is 20103997951. The reversal of 20103997931 is 13979930102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20103997931 - 2⁶ = 20103997867 is a prime.

It is a super-2 number, since 2×20103997931² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20103997951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10051998965 + 10051998966.

It is an arithmetic number, because the mean of its divisors is an integer number (10051998966).

Almost surely, 2^20103997931 is an apocalyptic number.

20103997931 is a deficient number, since it is larger than the sum of its proper divisors (1).

20103997931 is an equidigital number, since it uses as much as digits as its factorization.

20103997931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 44.

The spelling of 20103997931 in words is "twenty billion, one hundred three million, nine hundred ninety-seven thousand, nine hundred thirty-one".