266290220 has 48 divisors (see below), whose sum is σ = 645718080. Its totient is φ = 90353664.

The previous prime is 266290183. The next prime is 266290231. The reversal of 266290220 is 22092662.

266290220 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 polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3776 + ... + 23384.

It is an arithmetic number, because the mean of its divisors is an integer number (13452460).

Almost surely, 2^266290220 is an apocalyptic number.

266290220 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 266290220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322859040).

266290220 is an abundant number, since it is smaller than the sum of its proper divisors (379427860).

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

266290220 is a wasteful number, since it uses less digits than its factorization.

266290220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19722 (or 19720 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 266290220 is about 16318.4012697323. The cubic root of 266290220 is about 643.3565677190.

The spelling of 266290220 in words is "two hundred sixty-six million, two hundred ninety thousand, two hundred twenty".