20203605676817 has 2 divisors, whose sum is σ = 20203605676818. Its totient is φ = 20203605676816.

The previous prime is 20203605676799. The next prime is 20203605676897. The reversal of 20203605676817 is 71867650630202.

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., 20192225267776 + 11380409041 = 4493576^2 + 106679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20203605676817 is a prime.

It is not a weakly prime, because it can be changed into another prime (20203605676897) 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, 10101802838408 + 10101802838409.

It is an arithmetic number, because the mean of its divisors is an integer number (10101802838409).

Almost surely, 2^{20203605676817} is an apocalyptic number.

It is an amenable number.

20203605676817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20203605676817 is an equidigital number, since it uses as much as digits as its factorization.

20203605676817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 20203605676817 in words is "twenty trillion, two hundred three billion, six hundred five million, six hundred seventy-six thousand, eight hundred seventeen".