320660 has 12 divisors (see below), whose sum is σ = 673428. Its totient is φ = 128256.

The previous prime is 320659. The next prime is 320669. The reversal of 320660 is 66023.

It can be written as a sum of positive squares in 2 ways, for example, as 37636 + 283024 = 194^2 + 532^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320660.

It is not an unprimeable number, because it can be changed into a prime (320669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7997 + ... + 8036.

It is an arithmetic number, because the mean of its divisors is an integer number (56119).

2³²⁰⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

320660 is an abundant number, since it is smaller than the sum of its proper divisors (352768).

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

320660 is a wasteful number, since it uses less digits than its factorization.

320660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16042 (or 16040 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 320660 is about 566.2684875569. The cubic root of 320660 is about 68.4460299134.

Adding to 320660 its reverse (66023), we get a palindrome (386683).

The spelling of 320660 in words is "three hundred twenty thousand, six hundred sixty".