18820222 has 8 divisors (see below), whose sum is σ = 29716200. Its totient is φ = 8914824.

The previous prime is 18820213. The next prime is 18820253. The reversal of 18820222 is 22202881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×18820222² = 708401512258568, which contains 22 as substring.

It is a congruent number.

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, 247597 + ... + 247672.

It is an arithmetic number, because the mean of its divisors is an integer number (3714525).

Almost surely, 2^18820222 is an apocalyptic number.

18820222 is a deficient number, since it is larger than the sum of its proper divisors (10895978).

18820222 is a wasteful number, since it uses less digits than its factorization.

18820222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495290.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18820222 is about 4338.2279792560. The cubic root of 18820222 is about 265.9958824998.

The spelling of 18820222 in words is "eighteen million, eight hundred twenty thousand, two hundred twenty-two".