20431534514173 has 2 divisors, whose sum is σ = 20431534514174. Its totient is φ = 20431534514172.

The previous prime is 20431534514137. The next prime is 20431534514201. The reversal of 20431534514173 is 37141543513402.

Together with previous prime (20431534514137) 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., 20412522792484 + 19011721689 = 4518022^2 + 137883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20431534514173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20431534514273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215767257086 + 10215767257087.

It is an arithmetic number, because the mean of its divisors is an integer number (10215767257087).

Almost surely, 2^{20431534514173} is an apocalyptic number.

It is an amenable number.

20431534514173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431534514173 is an equidigital number, since it uses as much as digits as its factorization.

20431534514173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 20431534514173 in words is "twenty trillion, four hundred thirty-one billion, five hundred thirty-four million, five hundred fourteen thousand, one hundred seventy-three".