20601163728 has 80 divisors (see below), whose sum is σ = 60575289600. Its totient is φ = 6699559680.

The previous prime is 20601163721. The next prime is 20601163789. The reversal of 20601163728 is 82736110602.

20601163728 is a `hidden beast` number, since 2 + 0 + 6 + 0 + 11 + 637 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20601163692 and 20601163701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20601163721) 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, 563848 + ... + 599271.

It is an arithmetic number, because the mean of its divisors is an integer number (757191120).

Almost surely, 2^20601163728 is an apocalyptic number.

It is an amenable number.

20601163728 is an abundant number, since it is smaller than the sum of its proper divisors (39974125872).

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

20601163728 is a wasteful number, since it uses less digits than its factorization.

20601163728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163177 (or 1163165 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The spelling of 20601163728 in words is "twenty billion, six hundred one million, one hundred sixty-three thousand, seven hundred twenty-eight".