220644990 has 48 divisors (see below), whose sum is σ = 575359200. Its totient is φ = 58666176.

The previous prime is 220644979. The next prime is 220645001. The reversal of 220644990 is 99446022.

220644990 is a `hidden beast` number, since 2 + 2 + 0 + 644 + 9 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (220644979) and next prime (220645001).

It is a super-2 number, since 2×220644990² = 97368423224200200, which contains 22 as substring.

It is a congruent number.

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, 28896 + ... + 35724.

It is an arithmetic number, because the mean of its divisors is an integer number (11986650).

Almost surely, 2^220644990 is an apocalyptic number.

220644990 is an abundant number, since it is smaller than the sum of its proper divisors (354714210).

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

220644990 is a wasteful number, since it uses less digits than its factorization.

220644990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7201 (or 7198 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 220644990 is about 14854.1236698770. The cubic root of 220644990 is about 604.2704499846.

The spelling of 220644990 in words is "two hundred twenty million, six hundred forty-four thousand, nine hundred ninety".