20508860213 has 2 divisors, whose sum is σ = 20508860214. Its totient is φ = 20508860212.

The previous prime is 20508860173. The next prime is 20508860219. The reversal of 20508860213 is 31206880502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18839484049 + 1669376164 = 137257^2 + 40858^2 .

It is a cyclic number.

It is not a de Polignac number, because 20508860213 - 2²⁶ = 20441751349 is a prime.

It is a super-2 number, since 2×20508860213² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20508860219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10254430106 + 10254430107.

It is an arithmetic number, because the mean of its divisors is an integer number (10254430107).

Almost surely, 2^20508860213 is an apocalyptic number.

It is an amenable number.

20508860213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20508860213 is an equidigital number, since it uses as much as digits as its factorization.

20508860213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 20508860213 in words is "twenty billion, five hundred eight million, eight hundred sixty thousand, two hundred thirteen".