20138171072347 has 2 divisors, whose sum is σ = 20138171072348. Its totient is φ = 20138171072346.

The previous prime is 20138171072317. The next prime is 20138171072419. The reversal of 20138171072347 is 74327017183102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20138171072347 is a prime.

It is a super-3 number, since 3×20138171072347³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 20138171072297 and 20138171072306.

It is not a weakly prime, because it can be changed into another prime (20138171072317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10069085536173 + 10069085536174.

It is an arithmetic number, because the mean of its divisors is an integer number (10069085536174).

Almost surely, 2^{20138171072347} is an apocalyptic number.

20138171072347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20138171072347 is an equidigital number, since it uses as much as digits as its factorization.

20138171072347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 20138171072347 in words is "twenty trillion, one hundred thirty-eight billion, one hundred seventy-one million, seventy-two thousand, three hundred forty-seven".