22180440 has 32 divisors (see below), whose sum is σ = 66541680. Its totient is φ = 5914752.

The previous prime is 22180421. The next prime is 22180453. The reversal of 22180440 is 4408122.

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 7 ways as a sum of consecutive naturals, for example, 92299 + ... + 92538.

Almost surely, 2^22180440 is an apocalyptic number.

22180440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22180440 is an abundant number, since it is smaller than the sum of its proper divisors (44361240).

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

22180440 is a wasteful number, since it uses less digits than its factorization.

22180440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184851 (or 184847 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 22180440 is about 4709.6114489414. The cubic root of 22180440 is about 280.9679087645.

Adding to 22180440 its reverse (4408122), we get a palindrome (26588562).

The spelling of 22180440 in words is "twenty-two million, one hundred eighty thousand, four hundred forty".