266220 has 96 divisors (see below), whose sum is σ = 907200. Its totient is φ = 64512.

The previous prime is 266183. The next prime is 266221. The reversal of 266220 is 22662.

266220 is a `hidden beast` number, since 2 + 662 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 266193 and 266202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266221) by changing a digit.

266220 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9166 + ... + 9194.

It is an arithmetic number, because the mean of its divisors is an integer number (9450).

2²⁶⁶²²⁰ is an apocalyptic number.

266220 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 266220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (453600).

266220 is an abundant number, since it is smaller than the sum of its proper divisors (640980).

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

266220 is a wasteful number, since it uses less digits than its factorization.

266220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64 (or 56 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 266220 is about 515.9651150998. The cubic root of 266220 is about 64.3300012294.

Adding to 266220 its reverse (22662), we get a palindrome (288882).

The spelling of 266220 in words is "two hundred sixty-six thousand, two hundred twenty".