20681795612928 has 72 divisors (see below), whose sum is σ = 55078512306048. Its totient is φ = 6889576486912.

The previous prime is 20681795612923. The next prime is 20681795612939. The reversal of 20681795612928 is 82921659718602.

It is not an unprimeable number, because it can be changed into a prime (20681795612923) 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 7 ways as a sum of consecutive naturals, for example, 7290075 + ... + 9721562.

It is an arithmetic number, because the mean of its divisors is an integer number (764979337584).

Almost surely, 2^{20681795612928} is an apocalyptic number.

It is an amenable number.

20681795612928 is an abundant number, since it is smaller than the sum of its proper divisors (34396716693120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20681795612928 is a wasteful number, since it uses less digits than its factorization.

20681795612928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17013239 (or 17013225 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 66.

The spelling of 20681795612928 in words is "twenty trillion, six hundred eighty-one billion, seven hundred ninety-five million, six hundred twelve thousand, nine hundred twenty-eight".