20881333420728 has 128 divisors (see below), whose sum is σ = 57048271902720. Its totient is φ = 6316665384960.

The previous prime is 20881333420639. The next prime is 20881333420747. The reversal of 20881333420728 is 82702433318802.

It is a super-2 number, since 2×20881333420728² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404831676 + ... + 404883252.

It is an arithmetic number, because the mean of its divisors is an integer number (445689624240).

Almost surely, 2^{20881333420728} is an apocalyptic number.

It is an amenable number.

20881333420728 is an abundant number, since it is smaller than the sum of its proper divisors (36166938481992).

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

20881333420728 is a wasteful number, since it uses less digits than its factorization.

20881333420728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54237 (or 54233 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 20881333420728 in words is "twenty trillion, eight hundred eighty-one billion, three hundred thirty-three million, four hundred twenty thousand, seven hundred twenty-eight".