266320 has 20 divisors (see below), whose sum is σ = 619380. Its totient is φ = 106496.

The previous prime is 266297. The next prime is 266333. The reversal of 266320 is 23662.

It can be written as a sum of positive squares in 2 ways, for example, as 99856 + 166464 = 316^2 + 408^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1585 + ... + 1744.

It is an arithmetic number, because the mean of its divisors is an integer number (30969).

2²⁶⁶³²⁰ is an apocalyptic number.

266320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266320 is an abundant number, since it is smaller than the sum of its proper divisors (353060).

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

266320 is a wasteful number, since it uses less digits than its factorization.

266320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342 (or 3336 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 266320 is about 516.0620117777. The cubic root of 266320 is about 64.3380549629.

Adding to 266320 its reverse (23662), we get a palindrome (289982).

The spelling of 266320 in words is "two hundred sixty-six thousand, three hundred twenty".