20504728086 has 36 divisors (see below), whose sum is σ = 41835747828. Its totient is φ = 6699869072.

The previous prime is 20504728037. The next prime is 20504728099. The reversal of 20504728086 is 68082740502.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 18589411 + ... + 18590513.

Almost surely, 2^20504728086 is an apocalyptic number.

20504728086 is an abundant number, since it is smaller than the sum of its proper divisors (21331019742).

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

20504728086 is an frugal number, since it uses more digits than its factorization.

20504728086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317 (or 1161 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 20504728086 in words is "twenty billion, five hundred four million, seven hundred twenty-eight thousand, eighty-six".