20520050315503 has 4 divisors (see below), whose sum is σ = 20520714576168. Its totient is φ = 20519386054840.

The previous prime is 20520050315461. The next prime is 20520050315507. The reversal of 20520050315503 is 30551305002502.

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-20520050315503 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 (20520050315507) 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, 332083993 + ... + 332145778.

It is an arithmetic number, because the mean of its divisors is an integer number (5130178644042).

Almost surely, 2^{20520050315503} is an apocalyptic number.

20520050315503 is a deficient number, since it is larger than the sum of its proper divisors (664260665).

20520050315503 is an equidigital number, since it uses as much as digits as its factorization.

20520050315503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664260664.

The product of its (nonzero) digits is 22500, while the sum is 31.

The spelling of 20520050315503 in words is "twenty trillion, five hundred twenty billion, fifty million, three hundred fifteen thousand, five hundred three".