660220 has 24 divisors (see below), whose sum is σ = 1513008. Its totient is φ = 240000.

The previous prime is 660217. The next prime is 660227. The reversal of 660220 is 22066.

660220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 660194 and 660203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660227) 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, 1281 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (63042).

2⁶⁶⁰²²⁰ is an apocalyptic number.

It is an amenable number.

660220 is an abundant number, since it is smaller than the sum of its proper divisors (852788).

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

660220 is a wasteful number, since it uses less digits than its factorization.

660220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021 (or 3019 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 660220 is about 812.5392298222. The cubic root of 660220 is about 87.0755498234.

Adding to 660220 its reverse (22066), we get a palindrome (682286).

The spelling of 660220 in words is "six hundred sixty thousand, two hundred twenty".