20504030403 has 4 divisors (see below), whose sum is σ = 27338707208. Its totient is φ = 13669353600.

The previous prime is 20504030389. The next prime is 20504030473. The reversal of 20504030403 is 30403040502.

It is a happy number.

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

It is not a de Polignac number, because 20504030403 - 2⁴ = 20504030387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20504030403.

It is not an unprimeable number, because it can be changed into a prime (20504030473) 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, 3417338398 + ... + 3417338403.

It is an arithmetic number, because the mean of its divisors is an integer number (6834676802).

Almost surely, 2^20504030403 is an apocalyptic number.

20504030403 is a deficient number, since it is larger than the sum of its proper divisors (6834676805).

20504030403 is an equidigital number, since it uses as much as digits as its factorization.

20504030403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6834676804.

The product of its (nonzero) digits is 1440, while the sum is 21.

Adding to 20504030403 its reverse (30403040502), we get a palindrome (50907070905).

The spelling of 20504030403 in words is "twenty billion, five hundred four million, thirty thousand, four hundred three".