20500242503 has 4 divisors (see below), whose sum is σ = 22077184248. Its totient is φ = 18923300760.

The previous prime is 20500242491. The next prime is 20500242509. The reversal of 20500242503 is 30524200502.

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

It is not a de Polignac number, because 20500242503 - 2⁴ = 20500242487 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 (20500242509) 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, 788470853 + ... + 788470878.

It is an arithmetic number, because the mean of its divisors is an integer number (5519296062).

Almost surely, 2^20500242503 is an apocalyptic number.

20500242503 is a deficient number, since it is larger than the sum of its proper divisors (1576941745).

20500242503 is a wasteful number, since it uses less digits than its factorization.

20500242503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576941744.

The product of its (nonzero) digits is 2400, while the sum is 23.

The spelling of 20500242503 in words is "twenty billion, five hundred million, two hundred forty-two thousand, five hundred three".