20017058917 has 2 divisors, whose sum is σ = 20017058918. Its totient is φ = 20017058916.

The previous prime is 20017058879. The next prime is 20017058959. The reversal of 20017058917 is 71985071002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17969134401 + 2047924516 = 134049^2 + 45254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20017058917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20017058917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20017058717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008529458 + 10008529459.

It is an arithmetic number, because the mean of its divisors is an integer number (10008529459).

Almost surely, 2^20017058917 is an apocalyptic number.

It is an amenable number.

20017058917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20017058917 is an equidigital number, since it uses as much as digits as its factorization.

20017058917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 40.

The spelling of 20017058917 in words is "twenty billion, seventeen million, fifty-eight thousand, nine hundred seventeen".