18220402488 has 32 divisors (see below), whose sum is σ = 47948428800. Its totient is φ = 5753811168.

The previous prime is 18220402481. The next prime is 18220402531. The reversal of 18220402488 is 88420402281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220402481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19978056 + ... + 19978967.

It is an arithmetic number, because the mean of its divisors is an integer number (1498388400).

Almost surely, 2^18220402488 is an apocalyptic number.

It is an amenable number.

18220402488 is an abundant number, since it is smaller than the sum of its proper divisors (29728026312).

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

18220402488 is a wasteful number, since it uses less digits than its factorization.

18220402488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39957051 (or 39957047 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 39.

The spelling of 18220402488 in words is "eighteen billion, two hundred twenty million, four hundred two thousand, four hundred eighty-eight".