22031220 has 48 divisors (see below), whose sum is σ = 61891200. Its totient is φ = 5855616.

The previous prime is 22031209. The next prime is 22031237. The reversal of 22031220 is 2213022.

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 = 22031196 and 22031205.

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, 35634 + ... + 36246.

It is an arithmetic number, because the mean of its divisors is an integer number (1289400).

Almost surely, 2^22031220 is an apocalyptic number.

22031220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22031220 is an abundant number, since it is smaller than the sum of its proper divisors (39859980).

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

22031220 is a wasteful number, since it uses less digits than its factorization.

22031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 1222 counting only the distinct ones).

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

The square root of 22031220 is about 4693.7426431367. The cubic root of 22031220 is about 280.3364153685.

Adding to 22031220 its reverse (2213022), we get a palindrome (24244242).

The spelling of 22031220 in words is "twenty-two million, thirty-one thousand, two hundred twenty".