220644989 has 8 divisors (see below), whose sum is σ = 238033080. Its totient is φ = 203746816.

The previous prime is 220644979. The next prime is 220645001. The reversal of 220644989 is 989446022.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26265625 + 194379364 = 5125^2 + 13942^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220644989 - 2⁸ = 220644733 is a prime.

It is a super-2 number, since 2×220644989² = 97368422341620242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220644979) 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, 121544 + ... + 123345.

It is an arithmetic number, because the mean of its divisors is an integer number (29754135).

Almost surely, 2^220644989 is an apocalyptic number.

It is an amenable number.

220644989 is a deficient number, since it is larger than the sum of its proper divisors (17388091).

220644989 is a wasteful number, since it uses less digits than its factorization.

220644989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244959.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 220644989 is about 14854.1236362163. The cubic root of 220644989 is about 604.2704490717.

The spelling of 220644989 in words is "two hundred twenty million, six hundred forty-four thousand, nine hundred eighty-nine".