18220206 has 16 divisors (see below), whose sum is σ = 37425744. Its totient is φ = 5909184.

The previous prime is 18220193. The next prime is 18220247. The reversal of 18220206 is 60202281.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40815 + ... + 41258.

It is an arithmetic number, because the mean of its divisors is an integer number (2339109).

Almost surely, 2^18220206 is an apocalyptic number.

18220206 is an abundant number, since it is smaller than the sum of its proper divisors (19205538).

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

18220206 is a wasteful number, since it uses less digits than its factorization.

18220206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82115.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 18220206 is about 4268.5133243320. The cubic root of 18220206 is about 263.1385199448.

Adding to 18220206 its reverse (60202281), we get a palindrome (78422487).

The spelling of 18220206 in words is "eighteen million, two hundred twenty thousand, two hundred six".