20389872318 has 16 divisors (see below), whose sum is σ = 43178553360. Its totient is φ = 6396822656.

The previous prime is 20389872289. The next prime is 20389872329. The reversal of 20389872318 is 81327898302.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 99950253 + ... + 99950456.

It is an arithmetic number, because the mean of its divisors is an integer number (2698659585).

Almost surely, 2^20389872318 is an apocalyptic number.

20389872318 is an abundant number, since it is smaller than the sum of its proper divisors (22788681042).

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

20389872318 is a wasteful number, since it uses less digits than its factorization.

20389872318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199900731.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 20389872318 in words is "twenty billion, three hundred eighty-nine million, eight hundred seventy-two thousand, three hundred eighteen".