20303 has 4 divisors (see below), whose sum is σ = 20640. Its totient is φ = 19968.

The previous prime is 20297. The next prime is 20323. The reversal of 20303 is 30302.

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

It is a cyclic number.

It is not a de Polignac number, because 20303 - 2⁴ = 20287 is a prime.

It is a Duffinian number.

20303 is an undulating number in base 16.

20303 is a modest number, since divided by 303 gives 2 as remainder.

It is a plaindrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323) 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, 50 + ... + 207.

It is an arithmetic number, because the mean of its divisors is an integer number (5160).

2²⁰³⁰³ is an apocalyptic number.

20303 is a deficient number, since it is larger than the sum of its proper divisors (337).

20303 is an equidigital number, since it uses as much as digits as its factorization.

20303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336.

The product of its (nonzero) digits is 18, while the sum is 8.

The square root of 20303 is about 142.4885960349. The cubic root of 20303 is about 27.2805677794.

Adding to 20303 its reverse (30302), we get a palindrome (50605).

Subtracting 20303 from its reverse (30302), we obtain a palindrome (9999).

It can be divided in two parts, 20 and 303, that added together give a palindrome (323).

The spelling of 20303 in words is "twenty thousand, three hundred three", and thus it is an iban number.