18220368 has 40 divisors (see below), whose sum is σ = 47371968. Its totient is φ = 6034432.

The previous prime is 18220361. The next prime is 18220387. The reversal of 18220368 is 86302281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220361) 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, 6880 + ... + 9152.

Almost surely, 2^18220368 is an apocalyptic number.

It is an amenable number.

18220368 is an abundant number, since it is smaller than the sum of its proper divisors (29151600).

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

18220368 is a wasteful number, since it uses less digits than its factorization.

18220368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451 (or 2445 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18220368 is about 4268.5323004518. The cubic root of 18220368 is about 263.1392998173.

The spelling of 18220368 in words is "eighteen million, two hundred twenty thousand, three hundred sixty-eight".