20558620613 has 2 divisors, whose sum is σ = 20558620614. Its totient is φ = 20558620612.

The previous prime is 20558620601. The next prime is 20558620657. The reversal of 20558620613 is 31602685502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19904130724 + 654489889 = 141082^2 + 25583^2 .

It is a cyclic number.

It is not a de Polignac number, because 20558620613 - 2²⁰ = 20557572037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20558620213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10279310306 + 10279310307.

It is an arithmetic number, because the mean of its divisors is an integer number (10279310307).

Almost surely, 2^20558620613 is an apocalyptic number.

It is an amenable number.

20558620613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20558620613 is an equidigital number, since it uses as much as digits as its factorization.

20558620613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 20558620613 in words is "twenty billion, five hundred fifty-eight million, six hundred twenty thousand, six hundred thirteen".