22209220 has 48 divisors (see below), whose sum is σ = 51283008. Its totient is φ = 8012160.

The previous prime is 22209211. The next prime is 22209251. The reversal of 22209220 is 2290222.

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 15 ways as a sum of consecutive naturals, for example, 34219 + ... + 34861.

It is an arithmetic number, because the mean of its divisors is an integer number (1068396).

Almost surely, 2^22209220 is an apocalyptic number.

22209220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22209220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25641504).

22209220 is an abundant number, since it is smaller than the sum of its proper divisors (29073788).

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

22209220 is a wasteful number, since it uses less digits than its factorization.

22209220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 22209220 is about 4712.6659121987. The cubic root of 22209220 is about 281.0893785749.

Adding to 22209220 its reverse (2290222), we get a palindrome (24499442).

The spelling of 22209220 in words is "twenty-two million, two hundred nine thousand, two hundred twenty".