20173354081 has 2 divisors, whose sum is σ = 20173354082. Its totient is φ = 20173354080.

The previous prime is 20173354051. The next prime is 20173354183. The reversal of 20173354081 is 18045337102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19809155025 + 364199056 = 140745^2 + 19084^2 .

It is a cyclic number.

It is not a de Polignac number, because 20173354081 - 2¹¹ = 20173352033 is a prime.

It is a super-2 number, since 2×20173354081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20173354001) 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, 10086677040 + 10086677041.

It is an arithmetic number, because the mean of its divisors is an integer number (10086677041).

Almost surely, 2^20173354081 is an apocalyptic number.

It is an amenable number.

20173354081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20173354081 is an equidigital number, since it uses as much as digits as its factorization.

20173354081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20173354081 in words is "twenty billion, one hundred seventy-three million, three hundred fifty-four thousand, eighty-one".