22181808 has 80 divisors (see below), whose sum is σ = 64031616. Its totient is φ = 6558720.

The previous prime is 22181801. The next prime is 22181813. The reversal of 22181808 is 80818122.

It is a super-2 number, since 2×22181808² = 984065212297728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (22181801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22216 + ... + 23192.

Almost surely, 2^22181808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22181808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32015808).

22181808 is an abundant number, since it is smaller than the sum of its proper divisors (41849808).

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

22181808 is a wasteful number, since it uses less digits than its factorization.

22181808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 22181808 is about 4709.7566816132. The cubic root of 22181808 is about 280.9736849679.

The spelling of 22181808 in words is "twenty-two million, one hundred eighty-one thousand, eight hundred eight".