20503512503 has 8 divisors (see below), whose sum is σ = 21695646720. Its totient is φ = 19322678520.

The previous prime is 20503512487. The next prime is 20503512581. The reversal of 20503512503 is 30521530502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20503512503 - 2⁴ = 20503512487 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 (20503512203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2821325 + ... + 2828582.

It is an arithmetic number, because the mean of its divisors is an integer number (2711955840).

Almost surely, 2^20503512503 is an apocalyptic number.

20503512503 is a deficient number, since it is larger than the sum of its proper divisors (1192134217).

20503512503 is a wasteful number, since it uses less digits than its factorization.

20503512503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650117.

The product of its (nonzero) digits is 4500, while the sum is 26.

The spelling of 20503512503 in words is "twenty billion, five hundred three million, five hundred twelve thousand, five hundred three".