22231220 has 24 divisors (see below), whose sum is σ = 50930208. Its totient is φ = 8084000.

The previous prime is 22231219. The next prime is 22231241. The reversal of 22231220 is 2213222.

It is a junction number, because it is equal to n+sod(n) for n = 22231195 and 22231204.

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, 50306 + ... + 50745.

It is an arithmetic number, because the mean of its divisors is an integer number (2122092).

Almost surely, 2^22231220 is an apocalyptic number.

22231220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22231220 is an abundant number, since it is smaller than the sum of its proper divisors (28698988).

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

22231220 is a wasteful number, since it uses less digits than its factorization.

22231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101071 (or 101069 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 22231220 is about 4714.9994697773. Note that the first 3 decimals coincide. The cubic root of 22231220 is about 281.1821617455.

Adding to 22231220 its reverse (2213222), we get a palindrome (24444442).

It can be divided in two parts, 2223 and 1220, that added together give a palindrome (3443).

The spelling of 22231220 in words is "twenty-two million, two hundred thirty-one thousand, two hundred twenty".