22123320 has 64 divisors (see below), whose sum is σ = 67029120. Its totient is φ = 5841024.

The previous prime is 22123319. The next prime is 22123349. The reversal of 22123320 is 2332122.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 22123320.

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, 11979 + ... + 13701.

It is an arithmetic number, because the mean of its divisors is an integer number (1047330).

Almost surely, 2^22123320 is an apocalyptic number.

22123320 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 22123320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33514560).

22123320 is an abundant number, since it is smaller than the sum of its proper divisors (44905800).

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

22123320 is a wasteful number, since it uses less digits than its factorization.

22123320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844 (or 1840 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 22123320 is about 4703.5433451814. The cubic root of 22123320 is about 280.7265146461.

Adding to 22123320 its reverse (2332122), we get a palindrome (24455442).

The spelling of 22123320 in words is "twenty-two million, one hundred twenty-three thousand, three hundred twenty".