20505505093 has 2 divisors, whose sum is σ = 20505505094. Its totient is φ = 20505505092.

The previous prime is 20505505079. The next prime is 20505505133. The reversal of 20505505093 is 39050550502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14907921604 + 5597583489 = 122098^2 + 74817^2 .

It is a cyclic number.

It is not a de Polignac number, because 20505505093 - 2²⁵ = 20471950661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20505502093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10252752546 + 10252752547.

It is an arithmetic number, because the mean of its divisors is an integer number (10252752547).

Almost surely, 2^20505505093 is an apocalyptic number.

It is an amenable number.

20505505093 is a deficient number, since it is larger than the sum of its proper divisors (1).

20505505093 is an equidigital number, since it uses as much as digits as its factorization.

20505505093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 33750, while the sum is 34.

The spelling of 20505505093 in words is "twenty billion, five hundred five million, five hundred five thousand, ninety-three".