20668075468728 has 64 divisors (see below), whose sum is σ = 51942286264320. Its totient is φ = 6853080998400.

The previous prime is 20668075468687. The next prime is 20668075468783. The reversal of 20668075468728 is 82786457086602.

It is a super-2 number, since 2×20668075468728² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256301551 + ... + 256382177.

It is an arithmetic number, because the mean of its divisors is an integer number (811598222880).

Almost surely, 2^{20668075468728} is an apocalyptic number.

It is an amenable number.

20668075468728 is an abundant number, since it is smaller than the sum of its proper divisors (31274210795592).

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

20668075468728 is a wasteful number, since it uses less digits than its factorization.

20668075468728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136748 (or 136744 counting only the distinct ones).

The product of its (nonzero) digits is 433520640, while the sum is 69.

The spelling of 20668075468728 in words is "twenty trillion, six hundred sixty-eight billion, seventy-five million, four hundred sixty-eight thousand, seven hundred twenty-eight".