20712001171 has 4 divisors (see below), whose sum is σ = 20712427912. Its totient is φ = 20711574432.

The previous prime is 20712001151. The next prime is 20712001181. The reversal of 20712001171 is 17110021702.

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

It is a cyclic number.

It is not a de Polignac number, because 20712001171 - 2¹³ = 20711992979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20712001111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129606 + ... + 241291.

It is an arithmetic number, because the mean of its divisors is an integer number (5178106978).

Almost surely, 2^20712001171 is an apocalyptic number.

20712001171 is a deficient number, since it is larger than the sum of its proper divisors (426741).

20712001171 is an equidigital number, since it uses as much as digits as its factorization.

20712001171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426740.

The product of its (nonzero) digits is 196, while the sum is 22.

Adding to 20712001171 its reverse (17110021702), we get a palindrome (37822022873).

The spelling of 20712001171 in words is "twenty billion, seven hundred twelve million, one thousand, one hundred seventy-one".