20203 has 4 divisors (see below), whose sum is σ = 20520.
Its totient is φ = 19888.
The previous prime is 20201. The next prime is 20219. The reversal of 20203 is 30202.
Adding to 20203 its reverse (30202), we get a palindrome (50405).
Subtracting 20203 from its reverse (30202), we obtain a palindrome (9999).
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30202 = 2 ⋅15101.
It is a cyclic number.
It is not a de Polignac number, because 20203 - 21 = 20201 is a prime.
It is a super-2 number, since 2×202032 = 816322418, which contains 22 as substring.
It is a d-powerful number, because it can be written as 23 + 0 + 29 + 0 + 39 .
It is a Duffinian number.
20203 is a lucky number.
It is a nialpdrome in base 14.
It is not an unprimeable number, because it can be changed into a prime (20201) 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, 25 + ... + 202.
It is an arithmetic number, because the mean of its divisors is an integer number (5130).
220203 is an apocalyptic number.
20203 is a deficient number, since it is larger than the sum of its proper divisors (317).
20203 is an equidigital number, since it uses as much as digits as its factorization.
20203 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 316.
The product of its (nonzero) digits is 12, while the sum is 7.
The square root of 20203 is about 142.1372576069.
The cubic root of 20203 is about 27.2357049844.
The spelling of 20203 in words is "twenty thousand, two hundred three", and thus it is an iban number.