20867646318 has 16 divisors (see below), whose sum is σ = 41820299136. Its totient is φ = 6941714360.

The previous prime is 20867646307. The next prime is 20867646361. The reversal of 20867646318 is 81364676802.

20867646318 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 3538746 + ... + 3544637.

It is an arithmetic number, because the mean of its divisors is an integer number (2613768696).

Almost surely, 2^20867646318 is an apocalyptic number.

20867646318 is an abundant number, since it is smaller than the sum of its proper divisors (20952652818).

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

20867646318 is a wasteful number, since it uses less digits than its factorization.

20867646318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7083879.

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 20867646318 in words is "twenty billion, eight hundred sixty-seven million, six hundred forty-six thousand, three hundred eighteen".