22345220 has 24 divisors (see below), whose sum is σ = 47040000. Its totient is φ = 8916192.

The previous prime is 22345207. The next prime is 22345231. The reversal of 22345220 is 2254322.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22345192 and 22345201.

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 7 ways as a sum of consecutive naturals, for example, 8861 + ... + 11099.

It is an arithmetic number, because the mean of its divisors is an integer number (1960000).

Almost surely, 2^22345220 is an apocalyptic number.

22345220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22345220 is an abundant number, since it is smaller than the sum of its proper divisors (24694780).

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

22345220 is a wasteful number, since it uses less digits than its factorization.

22345220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2747 (or 2745 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 22345220 is about 4727.0730901902. The cubic root of 22345220 is about 281.6619694294.

Adding to 22345220 its reverse (2254322), we get a palindrome (24599542).

The spelling of 22345220 in words is "twenty-two million, three hundred forty-five thousand, two hundred twenty".