20005711171171 has 4 divisors (see below), whose sum is σ = 21824412186744. Its totient is φ = 18187010155600.

The previous prime is 20005711171139. The next prime is 20005711171183. The reversal of 20005711171171 is 17117111750002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20005711171171 - 2⁵ = 20005711171139 is a prime.

It is a super-2 number, since 2×20005711171171² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005711171571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909350507770 + ... + 909350507791.

It is an arithmetic number, because the mean of its divisors is an integer number (5456103046686).

Almost surely, 2^{20005711171171} is an apocalyptic number.

20005711171171 is a deficient number, since it is larger than the sum of its proper divisors (1818701015573).

20005711171171 is a wasteful number, since it uses less digits than its factorization.

20005711171171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818701015572.

The product of its (nonzero) digits is 3430, while the sum is 34.

The spelling of 20005711171171 in words is "twenty trillion, five billion, seven hundred eleven million, one hundred seventy-one thousand, one hundred seventy-one".