20768533713 has 12 divisors (see below), whose sum is σ = 30151274868. Its totient is φ = 13775405280.

The previous prime is 20768533693. The next prime is 20768533727. The reversal of 20768533713 is 31733586702.

It can be written as a sum of positive squares in 2 ways, for example, as 17215539264 + 3552994449 = 131208^2 + 59607^2 .

It is not a de Polignac number, because 20768533713 - 2²⁸ = 20500098257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20768533733) 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 in 11 ways as a sum of consecutive naturals, for example, 5855118 + ... + 5858663.

It is an arithmetic number, because the mean of its divisors is an integer number (2512606239).

Almost surely, 2^20768533713 is an apocalyptic number.

It is an amenable number.

20768533713 is a deficient number, since it is larger than the sum of its proper divisors (9382741155).

20768533713 is a wasteful number, since it uses less digits than its factorization.

20768533713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11713984 (or 11713981 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 45.

The spelling of 20768533713 in words is "twenty billion, seven hundred sixty-eight million, five hundred thirty-three thousand, seven hundred thirteen".