320685 has 8 divisors (see below), whose sum is σ = 513120. Its totient is φ = 171024.

The previous prime is 320669. The next prime is 320687. The reversal of 320685 is 586023.

320685 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 320685 - 2⁴ = 320669 is a prime.

320685 is strictly pandigital in base 7.

It is a Curzon number.

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 320685.

It is not an unprimeable number, because it can be changed into a prime (320687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10675 + ... + 10704.

It is an arithmetic number, because the mean of its divisors is an integer number (64140).

2³²⁰⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

320685 is a deficient number, since it is larger than the sum of its proper divisors (192435).

320685 is a wasteful number, since it uses less digits than its factorization.

320685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21387.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 320685 is about 566.2905614612. The cubic root of 320685 is about 68.4478086471.

The spelling of 320685 in words is "three hundred twenty thousand, six hundred eighty-five".