18220022 has 16 divisors (see below), whose sum is σ = 29486592. Its totient is φ = 8411520.

The previous prime is 18219989. The next prime is 18220049. The reversal of 18220022 is 22002281.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 3254 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (1842912).

Almost surely, 2^18220022 is an apocalyptic number.

18220022 is a deficient number, since it is larger than the sum of its proper divisors (11266570).

18220022 is a wasteful number, since it uses less digits than its factorization.

18220022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10183.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 18220022 is about 4268.4917711060. The cubic root of 18220022 is about 263.1376341581.

The spelling of 18220022 in words is "eighteen million, two hundred twenty thousand, twenty-two".