220206660 has 48 divisors (see below), whose sum is σ = 618613632. Its totient is φ = 58528000.

The previous prime is 220206641. The next prime is 220206667. The reversal of 220206660 is 66602022.

It is a self number, because there is not a number n which added to its sum of digits gives 220206660.

It is not an unprimeable number, because it can be changed into a prime (220206667) 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, 12760 + ... + 24560.

It is an arithmetic number, because the mean of its divisors is an integer number (12887784).

Almost surely, 2^220206660 is an apocalyptic number.

220206660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220206660 is an abundant number, since it is smaller than the sum of its proper divisors (398406972).

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

220206660 is a wasteful number, since it uses less digits than its factorization.

220206660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12124 (or 12122 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 220206660 is about 14839.3618461172. The cubic root of 220206660 is about 603.8700398723.

Adding to 220206660 its reverse (66602022), we get a palindrome (286808682).

It can be divided in two parts, 22020 and 6660, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 220206660 in words is "two hundred twenty million, two hundred six thousand, six hundred sixty".