20192819917 has 2 divisors, whose sum is σ = 20192819918. Its totient is φ = 20192819916.

The previous prime is 20192819849. The next prime is 20192819947. The reversal of 20192819917 is 71991829102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19832807241 + 360012676 = 140829^2 + 18974^2 .

It is a cyclic number.

It is not a de Polignac number, because 20192819917 - 2⁷ = 20192819789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20192819947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10096409958 + 10096409959.

It is an arithmetic number, because the mean of its divisors is an integer number (10096409959).

Almost surely, 2^20192819917 is an apocalyptic number.

It is an amenable number.

20192819917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20192819917 is an equidigital number, since it uses as much as digits as its factorization.

20192819917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 49.

The spelling of 20192819917 in words is "twenty billion, one hundred ninety-two million, eight hundred nineteen thousand, nine hundred seventeen".