22008840 has 192 divisors, whose sum is σ = 81259200. Its totient is φ = 4741632.

The previous prime is 22008839. The next prime is 22008851. The reversal of 22008840 is 4880022.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 22008840.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 111622 + ... + 111818.

It is an arithmetic number, because the mean of its divisors is an integer number (423225).

Almost surely, 2^22008840 is an apocalyptic number.

22008840 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 22008840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40629600).

22008840 is an abundant number, since it is smaller than the sum of its proper divisors (59250360).

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

22008840 is a wasteful number, since it uses less digits than its factorization.

22008840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 22008840 is about 4691.3580123457. The cubic root of 22008840 is about 280.2414583848.

Adding to 22008840 its reverse (4880022), we get a palindrome (26888862).

The spelling of 22008840 in words is "twenty-two million, eight thousand, eight hundred forty".