22544440 has 32 divisors (see below), whose sum is σ = 52364160. Its totient is φ = 8726400.

The previous prime is 22544437. The next prime is 22544477. The reversal of 22544440 is 4444522.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7851 + ... + 10330.

It is an arithmetic number, because the mean of its divisors is an integer number (1636380).

Almost surely, 2^22544440 is an apocalyptic number.

22544440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22544440 is an abundant number, since it is smaller than the sum of its proper divisors (29819720).

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

22544440 is a wasteful number, since it uses less digits than its factorization.

22544440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18223 (or 18219 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 25.

The square root of 22544440 is about 4748.0985667949. The cubic root of 22544440 is about 282.4965515020.

Adding to 22544440 its reverse (4444522), we get a palindrome (26988962).

The spelling of 22544440 in words is "twenty-two million, five hundred forty-four thousand, four hundred forty".