20177783086864 has 80 divisors (see below), whose sum is σ = 42700523241600. Its totient is φ = 9180404674560.

The previous prime is 20177783086847. The next prime is 20177783086897. The reversal of 20177783086864 is 46868038777102.

It is a self number, because there is not a number n which added to its sum of digits gives 20177783086864.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112871119 + ... + 113049745.

It is an arithmetic number, because the mean of its divisors is an integer number (533756540520).

Almost surely, 2^{20177783086864} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20177783086864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21350261620800).

20177783086864 is an abundant number, since it is smaller than the sum of its proper divisors (22522740154736).

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

20177783086864 is a wasteful number, since it uses less digits than its factorization.

20177783086864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186368 (or 186362 counting only the distinct ones).

The product of its (nonzero) digits is 151732224, while the sum is 67.

The spelling of 20177783086864 in words is "twenty trillion, one hundred seventy-seven billion, seven hundred eighty-three million, eighty-six thousand, eight hundred sixty-four".