190296921999337

This number is a prime.

                                                            19029 6921999337

This prime was obtained by summing all of the divisors of 20^20 after reversing them. Let srd(n) denote the sum of the reversed divisors of n. When n=2, 20, and 22, srd(n^n) is prime, with no more values known. [Earls]