20504134403 has 2 divisors, whose sum is σ = 20504134404. Its totient is φ = 20504134402.

The previous prime is 20504134381. The next prime is 20504134429. The reversal of 20504134403 is 30443140502.

It is an a-pointer prime, because the next prime (20504134429) can be obtained adding 20504134403 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20504134403 - 2¹⁶ = 20504068867 is a prime.

It is not a weakly prime, because it can be changed into another prime (20504134303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252067201 + 10252067202.

It is an arithmetic number, because the mean of its divisors is an integer number (10252067202).

Almost surely, 2^20504134403 is an apocalyptic number.

20504134403 is a deficient number, since it is larger than the sum of its proper divisors (1).

20504134403 is an equidigital number, since it uses as much as digits as its factorization.

20504134403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 20504134403 its reverse (30443140502), we get a palindrome (50947274905).

The spelling of 20504134403 in words is "twenty billion, five hundred four million, one hundred thirty-four thousand, four hundred three".