22442240 has 72 divisors (see below), whose sum is σ = 54636120. Its totient is φ = 8830976.

The previous prime is 22442237. The next prime is 22442257. The reversal of 22442240 is 4224422.

It can be written as a sum of positive squares in 4 ways, for example, as 4734976 + 17707264 = 2176^2 + 4208^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 113822 + ... + 114018.

It is an arithmetic number, because the mean of its divisors is an integer number (758835).

Almost surely, 2^22442240 is an apocalyptic number.

22442240 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 22442240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27318060).

22442240 is an abundant number, since it is smaller than the sum of its proper divisors (32193880).

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

22442240 is an equidigital number, since it uses as much as digits as its factorization.

22442240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 22442240 is about 4737.3241392161. The cubic root of 22442240 is about 282.0690272483.

Adding to 22442240 its reverse (4224422), we get a palindrome (26666662).

The spelling of 22442240 in words is "twenty-two million, four hundred forty-two thousand, two hundred forty".