22205778 has 16 divisors (see below), whose sum is σ = 50756160. Its totient is φ = 6344496.

The previous prime is 22205773. The next prime is 22205779. The reversal of 22205778 is 87750222.

It is not an unprimeable number, because it can be changed into a prime (22205773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264313 + ... + 264396.

It is an arithmetic number, because the mean of its divisors is an integer number (3172260).

Almost surely, 2^22205778 is an apocalyptic number.

22205778 is an abundant number, since it is smaller than the sum of its proper divisors (28550382).

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

22205778 is a wasteful number, since it uses less digits than its factorization.

22205778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528721.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 22205778 is about 4712.3007119665. The cubic root of 22205778 is about 281.0748566837.

The spelling of 22205778 in words is "twenty-two million, two hundred five thousand, seven hundred seventy-eight".