20503504603 has 4 divisors (see below), whose sum is σ = 20508329808. Its totient is φ = 20498679400.

The previous prime is 20503504579. The next prime is 20503504631. The reversal of 20503504603 is 30640530502.

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-20503504603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20503504103) 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, 2406223 + ... + 2414728.

It is an arithmetic number, because the mean of its divisors is an integer number (5127082452).

Almost surely, 2^20503504603 is an apocalyptic number.

20503504603 is a deficient number, since it is larger than the sum of its proper divisors (4825205).

20503504603 is an equidigital number, since it uses as much as digits as its factorization.

20503504603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4825204.

The product of its (nonzero) digits is 10800, while the sum is 28.

The spelling of 20503504603 in words is "twenty billion, five hundred three million, five hundred four thousand, six hundred three".