20222218 has 4 divisors (see below), whose sum is σ = 30333330. Its totient is φ = 10111108.

The previous prime is 20222207. The next prime is 20222219. The reversal of 20222218 is 81222202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18983449 + 1238769 = 4357^2 + 1113^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20222195 and 20222204.

It is not an unprimeable number, because it can be changed into a prime (20222219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5055553 + ... + 5055556.

Almost surely, 2^20222218 is an apocalyptic number.

20222218 is a deficient number, since it is larger than the sum of its proper divisors (10111112).

20222218 is a wasteful number, since it uses less digits than its factorization.

20222218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10111111.

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

The square root of 20222218 is about 4496.9120516194. The cubic root of 20222218 is about 272.4433818908.

The spelling of 20222218 in words is "twenty million, two hundred twenty-two thousand, two hundred eighteen".