20317349957 has 2 divisors, whose sum is σ = 20317349958. Its totient is φ = 20317349956.

The previous prime is 20317349947. The next prime is 20317349963. The reversal of 20317349957 is 75994371302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18167265796 + 2150084161 = 134786^2 + 46369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20317349957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20317349947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158674978 + 10158674979.

It is an arithmetic number, because the mean of its divisors is an integer number (10158674979).

Almost surely, 2^20317349957 is an apocalyptic number.

It is an amenable number.

20317349957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20317349957 is an equidigital number, since it uses as much as digits as its factorization.

20317349957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 50.

The spelling of 20317349957 in words is "twenty billion, three hundred seventeen million, three hundred forty-nine thousand, nine hundred fifty-seven".