20328085521 has 12 divisors (see below), whose sum is σ = 29538617472. Its totient is φ = 13470905976.

The previous prime is 20328085517. The next prime is 20328085523. The reversal of 20328085521 is 12558082302.

20328085521 is a `hidden beast` number, since 20 + 3 + 2 + 80 + 8 + 552 + 1 = 666.

It is not a de Polignac number, because 20328085521 - 2² = 20328085517 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20328085523) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6761001 + ... + 6764006.

It is an arithmetic number, because the mean of its divisors is an integer number (2461551456).

Almost surely, 2^20328085521 is an apocalyptic number.

It is an amenable number.

20328085521 is a deficient number, since it is larger than the sum of its proper divisors (9210531951).

20328085521 is a wasteful number, since it uses less digits than its factorization.

20328085521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13525180 (or 13525177 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 20328085521 in words is "twenty billion, three hundred twenty-eight million, eighty-five thousand, five hundred twenty-one".