18220108 has 6 divisors (see below), whose sum is σ = 31885196. Its totient is φ = 9110052.

The previous prime is 18220099. The next prime is 18220109. The reversal of 18220108 is 80102281.

It is not an unprimeable number, because it can be changed into a prime (18220109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2277510 + ... + 2277517.

Almost surely, 2^18220108 is an apocalyptic number.

It is an amenable number.

18220108 is a deficient number, since it is larger than the sum of its proper divisors (13665088).

18220108 is a wasteful number, since it uses less digits than its factorization.

18220108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4555031 (or 4555029 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 18220108 is about 4268.5018449100. The cubic root of 18220108 is about 263.1380481678.

Adding to 18220108 its reverse (80102281), we get a palindrome (98322389).

The spelling of 18220108 in words is "eighteen million, two hundred twenty thousand, one hundred eight".