20405335193 has 2 divisors, whose sum is σ = 20405335194. Its totient is φ = 20405335192.

The previous prime is 20405335183. The next prime is 20405335199. The reversal of 20405335193 is 39153350402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14640274009 + 5765061184 = 120997^2 + 75928^2 .

It is a cyclic number.

It is not a de Polignac number, because 20405335193 - 2⁶ = 20405335129 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20405335199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202667596 + 10202667597.

It is an arithmetic number, because the mean of its divisors is an integer number (10202667597).

Almost surely, 2^20405335193 is an apocalyptic number.

It is an amenable number.

20405335193 is a deficient number, since it is larger than the sum of its proper divisors (1).

20405335193 is an equidigital number, since it uses as much as digits as its factorization.

20405335193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 35.

Adding to 20405335193 its reverse (39153350402), we get a palindrome (59558685595).

The spelling of 20405335193 in words is "twenty billion, four hundred five million, three hundred thirty-five thousand, one hundred ninety-three".