22012320 has 144 divisors (see below), whose sum is σ = 76416480. Its totient is φ = 5322240.

The previous prime is 22012303. The next prime is 22012321. The reversal of 22012320 is 2321022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22012296 and 22012305.

It is not an unprimeable number, because it can be changed into a prime (22012321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57891 + ... + 58269.

It is an arithmetic number, because the mean of its divisors is an integer number (530670).

Almost surely, 2^22012320 is an apocalyptic number.

22012320 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 22012320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38208240).

22012320 is an abundant number, since it is smaller than the sum of its proper divisors (54404160).

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

22012320 is a wasteful number, since it uses less digits than its factorization.

22012320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 22012320 is about 4691.7288924233. The cubic root of 22012320 is about 280.2562280392.

Adding to 22012320 its reverse (2321022), we get a palindrome (24333342).

The spelling of 22012320 in words is "twenty-two million, twelve thousand, three hundred twenty".