22220645 has 24 divisors (see below), whose sum is σ = 28879872. Its totient is φ = 16394400.

The previous prime is 22220629. The next prime is 22220651. The reversal of 22220645 is 54602222.

It is not a de Polignac number, because 22220645 - 2⁴ = 22220629 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22220645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81860 + ... + 82130.

It is an arithmetic number, because the mean of its divisors is an integer number (1203328).

Almost surely, 2^22220645 is an apocalyptic number.

It is an amenable number.

22220645 is a deficient number, since it is larger than the sum of its proper divisors (6659227).

22220645 is a wasteful number, since it uses less digits than its factorization.

22220645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 22220645 is about 4713.8779152625. The cubic root of 22220645 is about 281.1375702062.

Adding to 22220645 its reverse (54602222), we get a palindrome (76822867).

The spelling of 22220645 in words is "twenty-two million, two hundred twenty thousand, six hundred forty-five".