20103 has 4 divisors (see below), whose sum is σ = 26808. Its totient is φ = 13400.

The previous prime is 20101. The next prime is 20107. The reversal of 20103 is 30102.

20103 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 20103 - 2¹ = 20101 is a prime.

It is a D-number.

20103 is a lucky number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 20091 and 20100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101) 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, 3348 + ... + 3353.

It is an arithmetic number, because the mean of its divisors is an integer number (6702).

2²⁰¹⁰³ is an apocalyptic number.

20103 is a deficient number, since it is larger than the sum of its proper divisors (6705).

20103 is an equidigital number, since it uses as much as digits as its factorization.

20103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6704.

The product of its (nonzero) digits is 6, while the sum is 6.

The square root of 20103 is about 141.7850485771. The cubic root of 20103 is about 27.1906939041.

Adding to 20103 its reverse (30102), we get a palindrome (50205).

Subtracting 20103 from its reverse (30102), we obtain a palindrome (9999).

The spelling of 20103 in words is "twenty thousand, one hundred three", and thus it is an iban number.