20572821651128 has 64 divisors (see below), whose sum is σ = 39382009423200. Its totient is φ = 10072346296320.

The previous prime is 20572821651127. The next prime is 20572821651167. The reversal of 20572821651128 is 82115612827502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572821651127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439407176 + ... + 439453992.

Almost surely, 2^{20572821651128} is an apocalyptic number.

It is an amenable number.

20572821651128 is a deficient number, since it is larger than the sum of its proper divisors (18809187772072).

20572821651128 is a wasteful number, since it uses less digits than its factorization.

20572821651128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50520 (or 50516 counting only the distinct ones).

The product of its (nonzero) digits is 1075200, while the sum is 50.

The spelling of 20572821651128 in words is "twenty trillion, five hundred seventy-two billion, eight hundred twenty-one million, six hundred fifty-one thousand, one hundred twenty-eight".