20516573672 has 32 divisors (see below), whose sum is σ = 44062056000. Its totient is φ = 8773223424.

The previous prime is 20516573663. The next prime is 20516573677. The reversal of 20516573672 is 27637561502.

It is not an unprimeable number, because it can be changed into a prime (20516573677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382838 + ... + 433125.

It is an arithmetic number, because the mean of its divisors is an integer number (1376939250).

Almost surely, 2^20516573672 is an apocalyptic number.

It is an amenable number.

20516573672 is an abundant number, since it is smaller than the sum of its proper divisors (23545482328).

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

20516573672 is a wasteful number, since it uses less digits than its factorization.

20516573672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816425 (or 816421 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 20516573672 in words is "twenty billion, five hundred sixteen million, five hundred seventy-three thousand, six hundred seventy-two".