20108503 has 4 divisors (see below), whose sum is σ = 20131488. Its totient is φ = 20085520.

The previous prime is 20108497. The next prime is 20108521. The reversal of 20108503 is 30580102.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20108503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108533) 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, 10126 + ... + 11947.

It is an arithmetic number, because the mean of its divisors is an integer number (5032872).

Almost surely, 2^20108503 is an apocalyptic number.

20108503 is a deficient number, since it is larger than the sum of its proper divisors (22985).

20108503 is an equidigital number, since it uses as much as digits as its factorization.

20108503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22984.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 20108503 is about 4484.2505505380. The cubic root of 20108503 is about 271.9317474006.

Adding to 20108503 its reverse (30580102), we get a palindrome (50688605).

The spelling of 20108503 in words is "twenty million, one hundred eight thousand, five hundred three".