320503 has 4 divisors (see below), whose sum is σ = 324640. Its totient is φ = 316368.

The previous prime is 320483. The next prime is 320513. The reversal of 320503 is 305023.

It is a semiprime because it is the product of two primes.

It is a 4-Lehmer number, since φ(320503) divides (320503-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 320503 - 2⁵ = 320471 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1950 + ... + 2107.

It is an arithmetic number, because the mean of its divisors is an integer number (81160).

2³²⁰⁵⁰³ is an apocalyptic number.

320503 is a deficient number, since it is larger than the sum of its proper divisors (4137).

320503 is an equidigital number, since it uses as much as digits as its factorization.

320503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4136.

The product of its (nonzero) digits is 90, while the sum is 13.

The square root of 320503 is about 566.1298437638. The cubic root of 320503 is about 68.4348573516.

Adding to 320503 its reverse (305023), we get a palindrome (625526).

The spelling of 320503 in words is "three hundred twenty thousand, five hundred three".