20344517005717 has 2 divisors, whose sum is σ = 20344517005718. Its totient is φ = 20344517005716.

The previous prime is 20344517005711. The next prime is 20344517005733. The reversal of 20344517005717 is 71750071544302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20303080739236 + 41436266481 = 4505894^2 + 203559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20344517005717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20344517005711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172258502858 + 10172258502859.

It is an arithmetic number, because the mean of its divisors is an integer number (10172258502859).

Almost surely, 2^{20344517005717} is an apocalyptic number.

It is an amenable number.

20344517005717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344517005717 is an equidigital number, since it uses as much as digits as its factorization.

20344517005717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 823200, while the sum is 46.

The spelling of 20344517005717 in words is "twenty trillion, three hundred forty-four billion, five hundred seventeen million, five thousand, seven hundred seventeen".