220666000 has 80 divisors (see below), whose sum is σ = 561749760. Its totient is φ = 83606400.

The previous prime is 220665997. The next prime is 220666021. The reversal of 220666000 is 666022.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35097 + ... + 40903.

It is an arithmetic number, because the mean of its divisors is an integer number (7021872).

Almost surely, 2^220666000 is an apocalyptic number.

220666000 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 220666000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280874880).

220666000 is an abundant number, since it is smaller than the sum of its proper divisors (341083760).

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

220666000 is a wasteful number, since it uses less digits than its factorization.

220666000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5849 (or 5833 counting only the distinct ones).

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

The square root of 220666000 is about 14854.8308640657. The cubic root of 220666000 is about 604.2896290880.

Adding to 220666000 its sum of digits (22), we get a palindrome (220666022).

The spelling of 220666000 in words is "two hundred twenty million, six hundred sixty-six thousand".