20202042317 has 2 divisors, whose sum is σ = 20202042318. Its totient is φ = 20202042316.

The previous prime is 20202042313. The next prime is 20202042337. The reversal of 20202042317 is 71324020202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19531180516 + 670861801 = 139754^2 + 25901^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202042317 - 2² = 20202042313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20202042292 and 20202042301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202042313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101021158 + 10101021159.

It is an arithmetic number, because the mean of its divisors is an integer number (10101021159).

Almost surely, 2^20202042317 is an apocalyptic number.

It is an amenable number.

20202042317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202042317 is an equidigital number, since it uses as much as digits as its factorization.

20202042317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

Adding to 20202042317 its reverse (71324020202), we get a palindrome (91526062519).

The spelling of 20202042317 in words is "twenty billion, two hundred two million, forty-two thousand, three hundred seventeen".