220006660 has 24 divisors (see below), whose sum is σ = 462311640. Its totient is φ = 87945984.

The previous prime is 220006651. The next prime is 220006669. The reversal of 220006660 is 66600022.

It is an interprime number because it is at equal distance from previous prime (220006651) and next prime (220006669).

It can be written as a sum of positive squares in 4 ways, for example, as 492804 + 219513856 = 702^2 + 14816^2 .

220006660 is a modest number, since divided by 6660 gives 220 as remainder.

It is not an unprimeable number, because it can be changed into a prime (220006669) 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, 43546 + ... + 48334.

It is an arithmetic number, because the mean of its divisors is an integer number (19262985).

Almost surely, 2^220006660 is an apocalyptic number.

220006660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220006660 is an abundant number, since it is smaller than the sum of its proper divisors (242304980).

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

220006660 is a wasteful number, since it uses less digits than its factorization.

220006660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7095 (or 7093 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 220006660 is about 14832.6214810464. The cubic root of 220006660 is about 603.6871653091.

Adding to 220006660 its reverse (66600022), we get a palindrome (286606682).

The spelling of 220006660 in words is "two hundred twenty million, six thousand, six hundred sixty".