2220644 has 24 divisors (see below), whose sum is σ = 4166400. Its totient is φ = 1032480.

The previous prime is 2220643. The next prime is 2220653. The reversal of 2220644 is 4460222.

It is not an unprimeable number, because it can be changed into a prime (2220643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4397 + ... + 4875.

It is an arithmetic number, because the mean of its divisors is an integer number (173600).

2^2220644 is an apocalyptic number.

It is an amenable number.

2220644 is a deficient number, since it is larger than the sum of its proper divisors (1945756).

2220644 is a wasteful number, since it uses less digits than its factorization.

2220644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2220644 is about 1490.1825391542. The cubic root of 2220644 is about 130.4646880672.

Adding to 2220644 its reverse (4460222), we get a palindrome (6680866).

The spelling of 2220644 in words is "two million, two hundred twenty thousand, six hundred forty-four".