18220204 has 6 divisors (see below), whose sum is σ = 31885364. Its totient is φ = 9110100.

The previous prime is 18220193. The next prime is 18220247. The reversal of 18220204 is 40202281.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277522 + ... + 2277529.

Almost surely, 2^18220204 is an apocalyptic number.

It is an amenable number.

18220204 is a deficient number, since it is larger than the sum of its proper divisors (13665160).

18220204 is a wasteful number, since it uses less digits than its factorization.

18220204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4555055 (or 4555053 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 18220204 is about 4268.5130900584. The cubic root of 18220204 is about 263.1385103167.

Adding to 18220204 its reverse (40202281), we get a palindrome (58422485).

The spelling of 18220204 in words is "eighteen million, two hundred twenty thousand, two hundred four".