18222020384 has 24 divisors (see below), whose sum is σ = 37984874508. Its totient is φ = 8575068160.

The previous prime is 18222020329. The next prime is 18222020407. The reversal of 18222020384 is 48302022281.

It can be written as a sum of positive squares in 2 ways, for example, as 18217440784 + 4579600 = 134972^2 + 2140^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 18222020384.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16747637 + ... + 16748724.

Almost surely, 2^18222020384 is an apocalyptic number.

It is an amenable number.

18222020384 is an abundant number, since it is smaller than the sum of its proper divisors (19762854124).

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

18222020384 is a wasteful number, since it uses less digits than its factorization.

18222020384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33496388 (or 33496380 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The spelling of 18222020384 in words is "eighteen billion, two hundred twenty-two million, twenty thousand, three hundred eighty-four".