20503136 has 24 divisors (see below), whose sum is σ = 40483800. Its totient is φ = 10221568.

The previous prime is 20503129. The next prime is 20503141. The reversal of 20503136 is 63130502.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 13655 + ... + 15081.

It is an arithmetic number, because the mean of its divisors is an integer number (1686825).

Almost surely, 2^20503136 is an apocalyptic number.

It is an amenable number.

20503136 is a deficient number, since it is larger than the sum of its proper divisors (19980664).

20503136 is a wasteful number, since it uses less digits than its factorization.

20503136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1886 (or 1878 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 20503136 is about 4528.0388690911. The cubic root of 20503136 is about 273.6991387476.

Adding to 20503136 its reverse (63130502), we get a palindrome (83633638).

The spelling of 20503136 in words is "twenty million, five hundred three thousand, one hundred thirty-six".