20503205001 has 32 divisors (see below), whose sum is σ = 31436256000. Its totient is φ = 13191704064.

The previous prime is 20503204973. The next prime is 20503205053. The reversal of 20503205001 is 10050230502.

It is a happy number.

It is not a de Polignac number, because 20503205001 - 2⁹ = 20503204489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20503205071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2477196 + ... + 2485458.

It is an arithmetic number, because the mean of its divisors is an integer number (982383000).

Almost surely, 2^20503205001 is an apocalyptic number.

It is an amenable number.

20503205001 is a deficient number, since it is larger than the sum of its proper divisors (10933050999).

20503205001 is a wasteful number, since it uses less digits than its factorization.

20503205001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11470 (or 11464 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

Adding to 20503205001 its reverse (10050230502), we get a palindrome (30553435503).

The spelling of 20503205001 in words is "twenty billion, five hundred three million, two hundred five thousand, one".