220287660 has 24 divisors (see below), whose sum is σ = 616805616. Its totient is φ = 58743360.

The previous prime is 220287659. The next prime is 220287673. The reversal of 220287660 is 66782022.

220287660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1835671 + ... + 1835790.

It is an arithmetic number, because the mean of its divisors is an integer number (25700234).

Almost surely, 2^220287660 is an apocalyptic number.

220287660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220287660 is an abundant number, since it is smaller than the sum of its proper divisors (396517956).

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

220287660 is a wasteful number, since it uses less digits than its factorization.

220287660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671473 (or 3671471 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 220287660 is about 14842.0908230613. The cubic root of 220287660 is about 603.9440725667.

The spelling of 220287660 in words is "two hundred twenty million, two hundred eighty-seven thousand, six hundred sixty".