20542130173 has 2 divisors, whose sum is σ = 20542130174. Its totient is φ = 20542130172.

The previous prime is 20542130131. The next prime is 20542130177. The reversal of 20542130173 is 37103124502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12606349284 + 7935780889 = 112278^2 + 89083^2 .

It is a cyclic number.

It is not a de Polignac number, because 20542130173 - 2²¹ = 20540033021 is a prime.

It is a super-2 number, since 2×20542130173² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20542130177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271065086 + 10271065087.

It is an arithmetic number, because the mean of its divisors is an integer number (10271065087).

Almost surely, 2^20542130173 is an apocalyptic number.

It is an amenable number.

20542130173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542130173 is an equidigital number, since it uses as much as digits as its factorization.

20542130173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 20542130173 its reverse (37103124502), we get a palindrome (57645254675).

The spelling of 20542130173 in words is "twenty billion, five hundred forty-two million, one hundred thirty thousand, one hundred seventy-three".