20505018103 has 2 divisors, whose sum is σ = 20505018104. Its totient is φ = 20505018102.

The previous prime is 20505018097. The next prime is 20505018119. The reversal of 20505018103 is 30181050502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20505018103 - 2²⁹ = 19968147191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20505018173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252509051 + 10252509052.

It is an arithmetic number, because the mean of its divisors is an integer number (10252509052).

Almost surely, 2^20505018103 is an apocalyptic number.

20505018103 is a deficient number, since it is larger than the sum of its proper divisors (1).

20505018103 is an equidigital number, since it uses as much as digits as its factorization.

20505018103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 20505018103 its reverse (30181050502), we get a palindrome (50686068605).

The spelling of 20505018103 in words is "twenty billion, five hundred five million, eighteen thousand, one hundred three".