20818388188 has 24 divisors (see below), whose sum is σ = 39240426960. Its totient is φ = 9607073280.

The previous prime is 20818388177. The next prime is 20818388197. The reversal of 20818388188 is 88188381802.

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, 382203 + ... + 433261.

It is an arithmetic number, because the mean of its divisors is an integer number (1635017790).

Almost surely, 2^20818388188 is an apocalyptic number.

It is an amenable number.

20818388188 is a deficient number, since it is larger than the sum of its proper divisors (18422038772).

20818388188 is a wasteful number, since it uses less digits than its factorization.

20818388188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58917 (or 58915 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 55.

The spelling of 20818388188 in words is "twenty billion, eight hundred eighteen million, three hundred eighty-eight thousand, one hundred eighty-eight".