20665734113 has 2 divisors, whose sum is σ = 20665734114. Its totient is φ = 20665734112.

The previous prime is 20665734107. The next prime is 20665734239. The reversal of 20665734113 is 31143756602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18275795344 + 2389938769 = 135188^2 + 48887^2 .

It is a cyclic number.

It is not a de Polignac number, because 20665734113 - 2⁴ = 20665734097 is a prime.

It is not a weakly prime, because it can be changed into another prime (20665704113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10332867056 + 10332867057.

It is an arithmetic number, because the mean of its divisors is an integer number (10332867057).

Almost surely, 2^20665734113 is an apocalyptic number.

It is an amenable number.

20665734113 is a deficient number, since it is larger than the sum of its proper divisors (1).

20665734113 is an equidigital number, since it uses as much as digits as its factorization.

20665734113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 20665734113 in words is "twenty billion, six hundred sixty-five million, seven hundred thirty-four thousand, one hundred thirteen".