20704005171 has 24 divisors (see below), whose sum is σ = 30702733776. Its totient is φ = 13438825920.

The previous prime is 20704005143. The next prime is 20704005209. The reversal of 20704005171 is 17150040702.

20704005171 is a `hidden beast` number, since 20 + 70 + 400 + 5 + 171 = 666.

It is not a de Polignac number, because 20704005171 - 2¹¹ = 20704003123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20704005131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103180 + ... + 228153.

It is an arithmetic number, because the mean of its divisors is an integer number (1279280574).

Almost surely, 2^20704005171 is an apocalyptic number.

20704005171 is a deficient number, since it is larger than the sum of its proper divisors (9998728605).

20704005171 is a wasteful number, since it uses less digits than its factorization.

20704005171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331523 (or 331520 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

Adding to 20704005171 its reverse (17150040702), we get a palindrome (37854045873).

The spelling of 20704005171 in words is "twenty billion, seven hundred four million, five thousand, one hundred seventy-one".