20342042173 has 2 divisors, whose sum is σ = 20342042174. Its totient is φ = 20342042172.

The previous prime is 20342042107. The next prime is 20342042183. The reversal of 20342042173 is 37124024302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18154328644 + 2187713529 = 134738^2 + 46773^2 .

It is a cyclic number.

It is not a de Polignac number, because 20342042173 - 2⁹ = 20342041661 is a prime.

It is a super-2 number, since 2×20342042173² (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 (20342042183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171021086 + 10171021087.

It is an arithmetic number, because the mean of its divisors is an integer number (10171021087).

Almost surely, 2^20342042173 is an apocalyptic number.

It is an amenable number.

20342042173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20342042173 is an equidigital number, since it uses as much as digits as its factorization.

20342042173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 28.

Adding to 20342042173 its reverse (37124024302), we get a palindrome (57466066475).

The spelling of 20342042173 in words is "twenty billion, three hundred forty-two million, forty-two thousand, one hundred seventy-three".