20873865584 has 40 divisors (see below), whose sum is σ = 47513594352. Its totient is φ = 8758264320.

The previous prime is 20873865563. The next prime is 20873865587. The reversal of 20873865584 is 48556837802.

It is a happy number.

It is a super-2 number, since 2×20873865584² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20873865587) 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, 4559309 + ... + 4563884.

Almost surely, 2^20873865584 is an apocalyptic number.

It is an amenable number.

20873865584 is an abundant number, since it is smaller than the sum of its proper divisors (26639728768).

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

20873865584 is a wasteful number, since it uses less digits than its factorization.

20873865584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9123225 (or 9123219 counting only the distinct ones).

The product of its (nonzero) digits is 12902400, while the sum is 56.

The spelling of 20873865584 in words is "twenty billion, eight hundred seventy-three million, eight hundred sixty-five thousand, five hundred eighty-four".