220644644 has 72 divisors (see below), whose sum is σ = 460857600. Its totient is φ = 91546560.

The previous prime is 220644637. The next prime is 220644661. The reversal of 220644644 is 446446022.

It is a self number, because there is not a number n which added to its sum of digits gives 220644644.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 460397 + ... + 460875.

It is an arithmetic number, because the mean of its divisors is an integer number (6400800).

Almost surely, 2^220644644 is an apocalyptic number.

It is an amenable number.

220644644 is an abundant number, since it is smaller than the sum of its proper divisors (240212956).

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

220644644 is a wasteful number, since it uses less digits than its factorization.

220644644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

The square root of 220644644 is about 14854.1120232749. The cubic root of 220644644 is about 604.2701341263.

The spelling of 220644644 in words is "two hundred twenty million, six hundred forty-four thousand, six hundred forty-four".