18227972320 has 24 divisors (see below), whose sum is σ = 43063584984. Its totient is φ = 7291188864.

The previous prime is 18227972309. The next prime is 18227972327. The reversal of 18227972320 is 2327972281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227972327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56962254 + ... + 56962573.

It is an arithmetic number, because the mean of its divisors is an integer number (1794316041).

Almost surely, 2^18227972320 is an apocalyptic number.

18227972320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18227972320 is an abundant number, since it is smaller than the sum of its proper divisors (24835612664).

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

18227972320 is a wasteful number, since it uses less digits than its factorization.

18227972320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113924842 (or 113924834 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 18227972320 in words is "eighteen billion, two hundred twenty-seven million, nine hundred seventy-two thousand, three hundred twenty".