22131320 has 32 divisors (see below), whose sum is σ = 49939200. Its totient is φ = 8827008.

The previous prime is 22131289. The next prime is 22131397. The reversal of 22131320 is 2313122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22131295 and 22131304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19817 + ... + 20903.

It is an arithmetic number, because the mean of its divisors is an integer number (1560600).

Almost surely, 2^22131320 is an apocalyptic number.

22131320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22131320 is an abundant number, since it is smaller than the sum of its proper divisors (27807880).

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

22131320 is a wasteful number, since it uses less digits than its factorization.

22131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607 (or 1603 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 22131320 is about 4704.3936910084. The cubic root of 22131320 is about 280.7603483484.

Adding to 22131320 its reverse (2313122), we get a palindrome (24444442).

The spelling of 22131320 in words is "twenty-two million, one hundred thirty-one thousand, three hundred twenty".