20038738423243 has 2 divisors, whose sum is σ = 20038738423244. Its totient is φ = 20038738423242.

The previous prime is 20038738423177. The next prime is 20038738423247. The reversal of 20038738423243 is 34232483783002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20038738423243 - 2¹³ = 20038738415051 is a prime.

It is a super-5 number, since 5×20038738423243⁵ (a number of 68 digits) contains 55555 as substring.

It is not a weakly prime, because it can be changed into another prime (20038738423247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10019369211621 + 10019369211622.

It is an arithmetic number, because the mean of its divisors is an integer number (10019369211622).

Almost surely, 2^{20038738423243} is an apocalyptic number.

20038738423243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20038738423243 is an equidigital number, since it uses as much as digits as its factorization.

20038738423243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4644864, while the sum is 49.

The spelling of 20038738423243 in words is "twenty trillion, thirty-eight billion, seven hundred thirty-eight million, four hundred twenty-three thousand, two hundred forty-three".