20345020505237 has 2 divisors, whose sum is σ = 20345020505238. Its totient is φ = 20345020505236.

The previous prime is 20345020505189. The next prime is 20345020505273. The reversal of 20345020505237 is 73250502054302.

Together with next prime (20345020505273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18800843968036 + 1544176537201 = 4335994^2 + 1242649^2 .

It is a cyclic number.

It is not a de Polignac number, because 20345020505237 - 2⁸ = 20345020504981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20345020505237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345020505297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172510252618 + 10172510252619.

It is an arithmetic number, because the mean of its divisors is an integer number (10172510252619).

Almost surely, 2^{20345020505237} is an apocalyptic number.

It is an amenable number.

20345020505237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345020505237 is an equidigital number, since it uses as much as digits as its factorization.

20345020505237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252000, while the sum is 38.

Adding to 20345020505237 its reverse (73250502054302), we get a palindrome (93595522559539).

The spelling of 20345020505237 in words is "twenty trillion, three hundred forty-five billion, twenty million, five hundred five thousand, two hundred thirty-seven".