20345327917 has 2 divisors, whose sum is σ = 20345327918. Its totient is φ = 20345327916.

The previous prime is 20345327903. The next prime is 20345328007. The reversal of 20345327917 is 71972354302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19617083721 + 728244196 = 140061^2 + 26986^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345327917 - 2²⁷ = 20211110189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345327017) by changing a digit.

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 as a sum of consecutive naturals, namely, 10172663958 + 10172663959.

It is an arithmetic number, because the mean of its divisors is an integer number (10172663959).

Almost surely, 2^20345327917 is an apocalyptic number.

It is an amenable number.

20345327917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345327917 is an equidigital number, since it uses as much as digits as its factorization.

20345327917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 43.

The spelling of 20345327917 in words is "twenty billion, three hundred forty-five million, three hundred twenty-seven thousand, nine hundred seventeen".