18220304 has 40 divisors (see below), whose sum is σ = 36729792. Its totient is φ = 8749440.

The previous prime is 18220291. The next prime is 18220313. The reversal of 18220304 is 40302281.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48662 + ... + 49034.

Almost surely, 2^18220304 is an apocalyptic number.

It is an amenable number.

18220304 is an abundant number, since it is smaller than the sum of its proper divisors (18509488).

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

18220304 is a wasteful number, since it uses less digits than its factorization.

18220304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18220304 is about 4268.5248037232. The cubic root of 18220304 is about 263.1389917201.

Adding to 18220304 its reverse (40302281), we get a palindrome (58522585).

The spelling of 18220304 in words is "eighteen million, two hundred twenty thousand, three hundred four".