20811968079 has 96 divisors (see below), whose sum is σ = 35180544000. Its totient is φ = 10679610240.

The previous prime is 20811968029. The next prime is 20811968101. The reversal of 20811968079 is 97086911802.

It is not a de Polignac number, because 20811968079 - 2¹² = 20811963983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20811968029) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 34744222 + ... + 34744820.

It is an arithmetic number, because the mean of its divisors is an integer number (366464000).

Almost surely, 2^20811968079 is an apocalyptic number.

20811968079 is a deficient number, since it is larger than the sum of its proper divisors (14368575921).

20811968079 is a wasteful number, since it uses less digits than its factorization.

20811968079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 712 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 51.

The spelling of 20811968079 in words is "twenty billion, eight hundred eleven million, nine hundred sixty-eight thousand, seventy-nine".