18420196 has 12 divisors (see below), whose sum is σ = 33932080. Its totient is φ = 8725320.

The previous prime is 18420161. The next prime is 18420209. The reversal of 18420196 is 69102481.

It is a happy number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121110 + ... + 121261.

Almost surely, 2^18420196 is an apocalyptic number.

It is an amenable number.

18420196 is a deficient number, since it is larger than the sum of its proper divisors (15511884).

18420196 is a wasteful number, since it uses less digits than its factorization.

18420196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242394 (or 242392 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18420196 is about 4291.8755806757. The cubic root of 18420196 is about 264.0977790545.

The spelling of 18420196 in words is "eighteen million, four hundred twenty thousand, one hundred ninety-six".