20105103 has 4 divisors (see below), whose sum is σ = 26806808. Its totient is φ = 13403400.

The previous prime is 20105089. The next prime is 20105117. The reversal of 20105103 is 30150102.

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

It is an interprime number because it is at equal distance from previous prime (20105089) and next prime (20105117).

It is not a de Polignac number, because 20105103 - 2⁴ = 20105087 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 (20105303) 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, 3350848 + ... + 3350853.

It is an arithmetic number, because the mean of its divisors is an integer number (6701702).

Almost surely, 2^20105103 is an apocalyptic number.

20105103 is a deficient number, since it is larger than the sum of its proper divisors (6701705).

20105103 is an equidigital number, since it uses as much as digits as its factorization.

20105103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6701704.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 20105103 is about 4483.8714299141. The cubic root of 20105103 is about 271.9164202186.

Adding to 20105103 its reverse (30150102), we get a palindrome (50255205).

The spelling of 20105103 in words is "twenty million, one hundred five thousand, one hundred three".