20345505135103 has 2 divisors, whose sum is σ = 20345505135104. Its totient is φ = 20345505135102.

The previous prime is 20345505134989. The next prime is 20345505135113. The reversal of 20345505135103 is 30153150554302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20345505135103 - 2¹³ = 20345505126911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345505135113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172752567551 + 10172752567552.

It is an arithmetic number, because the mean of its divisors is an integer number (10172752567552).

Almost surely, 2^{20345505135103} is an apocalyptic number.

20345505135103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345505135103 is an equidigital number, since it uses as much as digits as its factorization.

20345505135103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 135000, while the sum is 37.

Adding to 20345505135103 its reverse (30153150554302), we get a palindrome (50498655689405).

The spelling of 20345505135103 in words is "twenty trillion, three hundred forty-five billion, five hundred five million, one hundred thirty-five thousand, one hundred three".