20345005237 has 2 divisors, whose sum is σ = 20345005238. Its totient is φ = 20345005236.

The previous prime is 20345005211. The next prime is 20345005253. The reversal of 20345005237 is 73250054302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20014892676 + 330112561 = 141474^2 + 18169^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20345005237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20345005199 and 20345005208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20345005207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10172502618 + 10172502619.

It is an arithmetic number, because the mean of its divisors is an integer number (10172502619).

Almost surely, 2^20345005237 is an apocalyptic number.

It is an amenable number.

20345005237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20345005237 is an equidigital number, since it uses as much as digits as its factorization.

20345005237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 31.

Adding to 20345005237 its reverse (73250054302), we get a palindrome (93595059539).

The spelling of 20345005237 in words is "twenty billion, three hundred forty-five million, five thousand, two hundred thirty-seven".