20503551113305 has 64 divisors (see below), whose sum is σ = 26875894348800. Its totient is φ = 14926096797696.

The previous prime is 20503551113209. The next prime is 20503551113329. The reversal of 20503551113305 is 50331115530502.

It is not a de Polignac number, because 20503551113305 - 2¹¹ = 20503551111257 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1839042871 + ... + 1839054019.

It is an arithmetic number, because the mean of its divisors is an integer number (419935849200).

Almost surely, 2^{20503551113305} is an apocalyptic number.

It is an amenable number.

20503551113305 is a deficient number, since it is larger than the sum of its proper divisors (6372343235495).

20503551113305 is a wasteful number, since it uses less digits than its factorization.

20503551113305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12610.

The product of its (nonzero) digits is 33750, while the sum is 34.

Adding to 20503551113305 its reverse (50331115530502), we get a palindrome (70834666643807).

The spelling of 20503551113305 in words is "twenty trillion, five hundred three billion, five hundred fifty-one million, one hundred thirteen thousand, three hundred five".