20686615830113 has 2 divisors, whose sum is σ = 20686615830114. Its totient is φ = 20686615830112.

The previous prime is 20686615830091. The next prime is 20686615830187. The reversal of 20686615830113 is 31103851668602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10984935808609 + 9701680021504 = 3314353^2 + 3114752^2 .

It is a cyclic number.

It is not a de Polignac number, because 20686615830113 - 2³⁶ = 20617896353377 is a prime.

It is not a weakly prime, because it can be changed into another prime (20686615838113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10343307915056 + 10343307915057.

It is an arithmetic number, because the mean of its divisors is an integer number (10343307915057).

Almost surely, 2^{20686615830113} is an apocalyptic number.

It is an amenable number.

20686615830113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20686615830113 is an equidigital number, since it uses as much as digits as its factorization.

20686615830113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 20686615830113 in words is "twenty trillion, six hundred eighty-six billion, six hundred fifteen million, eight hundred thirty thousand, one hundred thirteen".