18227320 has 16 divisors (see below), whose sum is σ = 41011560. Its totient is φ = 7290912.

The previous prime is 18227317. The next prime is 18227323. The reversal of 18227320 is 2372281.

It is an interprime number because it is at equal distance from previous prime (18227317) and next prime (18227323).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227323) 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, 227802 + ... + 227881.

Almost surely, 2^18227320 is an apocalyptic number.

18227320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18227320 is an abundant number, since it is smaller than the sum of its proper divisors (22784240).

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

18227320 is a wasteful number, since it uses less digits than its factorization.

18227320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455694 (or 455690 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 18227320 is about 4269.3465542165. The cubic root of 18227320 is about 263.1727625845.

The spelling of 18227320 in words is "eighteen million, two hundred twenty-seven thousand, three hundred twenty".