220531660 has 48 divisors (see below), whose sum is σ = 485251200. Its totient is φ = 84075264.

The previous prime is 220531657. The next prime is 220531691. The reversal of 220531660 is 66135022.

220531660 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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43414 + ... + 48226.

It is an arithmetic number, because the mean of its divisors is an integer number (10109400).

Almost surely, 2^220531660 is an apocalyptic number.

220531660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220531660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242625600).

220531660 is an abundant number, since it is smaller than the sum of its proper divisors (264719540).

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

220531660 is a wasteful number, since it uses less digits than its factorization.

220531660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4930 (or 4928 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 220531660 is about 14850.3084143057. The cubic root of 220531660 is about 604.1669750190.

Adding to 220531660 its reverse (66135022), we get a palindrome (286666682).

The spelling of 220531660 in words is "two hundred twenty million, five hundred thirty-one thousand, six hundred sixty".