20503105 has 24 divisors (see below), whose sum is σ = 29884608. Its totient is φ = 13225728.

The previous prime is 20503099. The next prime is 20503111. The reversal of 20503105 is 50130502.

It is an interprime number because it is at equal distance from previous prime (20503099) and next prime (20503111).

It is not a de Polignac number, because 20503105 - 2⁵ = 20503073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9102 + ... + 11128.

It is an arithmetic number, because the mean of its divisors is an integer number (1245192).

Almost surely, 2^20503105 is an apocalyptic number.

It is an amenable number.

20503105 is a deficient number, since it is larger than the sum of its proper divisors (9381503).

20503105 is a wasteful number, since it uses less digits than its factorization.

20503105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2073 (or 2056 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 20503105 is about 4528.0354459743. The cubic root of 20503105 is about 273.6990008065.

Adding to 20503105 its reverse (50130502), we get a palindrome (70633607).

The spelling of 20503105 in words is "twenty million, five hundred three thousand, one hundred five".