20656645779716 has 24 divisors (see below), whose sum is σ = 36456297716160. Its totient is φ = 10240752971232.

The previous prime is 20656645779713. The next prime is 20656645779761. The reversal of 20656645779716 is 61797754665602.

20656645779716 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 20656645779716.

It is not an unprimeable number, because it can be changed into a prime (20656645779713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23601416 + ... + 24460991.

It is an arithmetic number, because the mean of its divisors is an integer number (1519012404840).

Almost surely, 2^{20656645779716} is an apocalyptic number.

It is an amenable number.

20656645779716 is a deficient number, since it is larger than the sum of its proper divisors (15799651936444).

20656645779716 is a wasteful number, since it uses less digits than its factorization.

20656645779716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48063323 (or 48063321 counting only the distinct ones).

The product of its (nonzero) digits is 800150400, while the sum is 71.

The spelling of 20656645779716 in words is "twenty trillion, six hundred fifty-six billion, six hundred forty-five million, seven hundred seventy-nine thousand, seven hundred sixteen".