320920 has 32 divisors (see below), whose sum is σ = 738720. Its totient is φ = 125440.

The previous prime is 320911. The next prime is 320923. The reversal of 320920 is 29023.

It is a junction number, because it is equal to n+sod(n) for n = 320894 and 320903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320923) by changing a digit.

320920 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 7 ways as a sum of consecutive naturals, for example, 2784 + ... + 2896.

It is an arithmetic number, because the mean of its divisors is an integer number (23085).

2³²⁰⁹²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 320920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (369360).

320920 is an abundant number, since it is smaller than the sum of its proper divisors (417800).

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

320920 is a wasteful number, since it uses less digits than its factorization.

320920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 320920 is about 566.4980141183. The cubic root of 320920 is about 68.4645242273.

Adding to 320920 its reverse (29023), we get a palindrome (349943).

The spelling of 320920 in words is "three hundred twenty thousand, nine hundred twenty".