20005686672 has 40 divisors (see below), whose sum is σ = 53928375744. Its totient is φ = 6378624384.

The previous prime is 20005686653. The next prime is 20005686689. The reversal of 20005686672 is 27668650002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9059443 + ... + 9061650.

Almost surely, 2^20005686672 is an apocalyptic number.

It is an amenable number.

20005686672 is an abundant number, since it is smaller than the sum of its proper divisors (33922689072).

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

20005686672 is a wasteful number, since it uses less digits than its factorization.

20005686672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18121127 (or 18121121 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 20005686672 in words is "twenty billion, five million, six hundred eighty-six thousand, six hundred seventy-two".