20708860864313 has 2 divisors, whose sum is σ = 20708860864314. Its totient is φ = 20708860864312.

The previous prime is 20708860864309. The next prime is 20708860864331. The reversal of 20708860864313 is 31346806880702.

Together with next prime (20708860864331) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18169784335609 + 2539076528704 = 4262603^2 + 1593448^2 .

It is a cyclic number.

It is not a de Polignac number, because 20708860864313 - 2² = 20708860864309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20708860864213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10354430432156 + 10354430432157.

It is an arithmetic number, because the mean of its divisors is an integer number (10354430432157).

Almost surely, 2^{20708860864313} is an apocalyptic number.

It is an amenable number.

20708860864313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20708860864313 is an equidigital number, since it uses as much as digits as its factorization.

20708860864313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9289728, while the sum is 56.

The spelling of 20708860864313 in words is "twenty trillion, seven hundred eight billion, eight hundred sixty million, eight hundred sixty-four thousand, three hundred thirteen".