20109103 has 4 divisors (see below), whose sum is σ = 22981840. Its totient is φ = 17236368.

The previous prime is 20109073. The next prime is 20109109. The reversal of 20109103 is 30190102.

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 20109103 - 2⁵ = 20109071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20109109) 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, 1436358 + ... + 1436371.

It is an arithmetic number, because the mean of its divisors is an integer number (5745460).

Almost surely, 2^20109103 is an apocalyptic number.

20109103 is a deficient number, since it is larger than the sum of its proper divisors (2872737).

20109103 is an equidigital number, since it uses as much as digits as its factorization.

20109103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872736.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 20109103 is about 4484.3174508502. The cubic root of 20109103 is about 271.9344520180.

Adding to 20109103 its reverse (30190102), we get a palindrome (50299205).

The spelling of 20109103 in words is "twenty million, one hundred nine thousand, one hundred three".