22031320 has 64 divisors (see below), whose sum is σ = 53071200. Its totient is φ = 8202240.

The previous prime is 22031311. The next prime is 22031333. The reversal of 22031320 is 2313022.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 22031320.

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 15 ways as a sum of consecutive naturals, for example, 121630 + ... + 121810.

Almost surely, 2^22031320 is an apocalyptic number.

22031320 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 22031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26535600).

22031320 is an abundant number, since it is smaller than the sum of its proper divisors (31039880).

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

22031320 is a wasteful number, since it uses less digits than its factorization.

22031320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 22031320 is about 4693.7532956047. The cubic root of 22031320 is about 280.3368395181.

Adding to 22031320 its reverse (2313022), we get a palindrome (24344342).

The spelling of 22031320 in words is "twenty-two million, thirty-one thousand, three hundred twenty".