266550220 has 48 divisors (see below), whose sum is σ = 599917248. Its totient is φ = 99221760.

The previous prime is 266550209. The next prime is 266550227. The reversal of 266550220 is 22055662.

It is not an unprimeable number, because it can be changed into a prime (266550227) 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, 9190 + ... + 24850.

It is an arithmetic number, because the mean of its divisors is an integer number (12498276).

Almost surely, 2^266550220 is an apocalyptic number.

266550220 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 266550220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299958624).

266550220 is an abundant number, since it is smaller than the sum of its proper divisors (333367028).

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

266550220 is a wasteful number, since it uses less digits than its factorization.

266550220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15730 (or 15728 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 266550220 is about 16326.3657927905. The cubic root of 266550220 is about 643.5658860793.

The spelling of 266550220 in words is "two hundred sixty-six million, five hundred fifty thousand, two hundred twenty".