22404440 has 32 divisors (see below), whose sum is σ = 50600160. Its totient is φ = 8928000.

The previous prime is 22404427. The next prime is 22404463. The reversal of 22404440 is 4440422.

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

It is a congruent number.

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, 11540 + ... + 13340.

It is an arithmetic number, because the mean of its divisors is an integer number (1581255).

Almost surely, 2^22404440 is an apocalyptic number.

22404440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22404440 is an abundant number, since it is smaller than the sum of its proper divisors (28195720).

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

22404440 is a wasteful number, since it uses less digits than its factorization.

22404440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123 (or 2119 counting only the distinct ones).

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

The square root of 22404440 is about 4733.3328638497. The cubic root of 22404440 is about 281.9105730559.

Adding to 22404440 its reverse (4440422), we get a palindrome (26844862).

The spelling of 22404440 in words is "twenty-two million, four hundred four thousand, four hundred forty".