22705218 has 16 divisors (see below), whose sum is σ = 50456160. Its totient is φ = 7568388.

The previous prime is 22705213. The next prime is 22705219. The reversal of 22705218 is 81250722.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 22705191 and 22705200.

It is not an unprimeable number, because it can be changed into a prime (22705213) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 210180 + ... + 210287.

It is an arithmetic number, because the mean of its divisors is an integer number (3153510).

Almost surely, 2^22705218 is an apocalyptic number.

22705218 is an abundant number, since it is smaller than the sum of its proper divisors (27750942).

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

22705218 is a wasteful number, since it uses less digits than its factorization.

22705218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420478 (or 420472 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 22705218 is about 4764.9992654774. Note that the first 3 decimals coincide. The cubic root of 22705218 is about 283.1665124868.

The spelling of 22705218 in words is "twenty-two million, seven hundred five thousand, two hundred eighteen".