20218222 has 8 divisors (see below), whose sum is σ = 30366000. Its totient is φ = 10096224.

The previous prime is 20218193. The next prime is 20218259. The reversal of 20218222 is 22281202.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20218222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4347 + ... + 7702.

It is an arithmetic number, because the mean of its divisors is an integer number (3795750).

Almost surely, 2^20218222 is an apocalyptic number.

20218222 is a deficient number, since it is larger than the sum of its proper divisors (10147778).

20218222 is a wasteful number, since it uses less digits than its factorization.

20218222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12890.

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

The square root of 20218222 is about 4496.4677247813. The cubic root of 20218222 is about 272.4254353683.

Adding to 20218222 its reverse (22281202), we get a palindrome (42499424).

The spelling of 20218222 in words is "twenty million, two hundred eighteen thousand, two hundred twenty-two".