220643988 has 48 divisors (see below), whose sum is σ = 533030400. Its totient is φ = 70963200.

The previous prime is 220643981. The next prime is 220643993. The reversal of 220643988 is 889346022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220643981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166368 + ... + 167688.

It is an arithmetic number, because the mean of its divisors is an integer number (11104800).

Almost surely, 2^220643988 is an apocalyptic number.

It is an amenable number.

220643988 is an abundant number, since it is smaller than the sum of its proper divisors (312386412).

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

220643988 is a wasteful number, since it uses less digits than its factorization.

220643988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808 (or 1806 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 220643988 is about 14854.0899418308. The cubic root of 220643988 is about 604.2695352725.

The spelling of 220643988 in words is "two hundred twenty million, six hundred forty-three thousand, nine hundred eighty-eight".