20402430120171 has 12 divisors (see below), whose sum is σ = 32149283825880. Its totient is φ = 12365109163680.

The previous prime is 20402430120169. The next prime is 20402430120187. The reversal of 20402430120171 is 17102103420402.

20402430120171 is a `hidden beast` number, since 2 + 0 + 40 + 2 + 430 + 1 + 20 + 171 = 666.

It is not a de Polignac number, because 20402430120171 - 2¹ = 20402430120169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20402430120671) 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 11 ways as a sum of consecutive naturals, for example, 103042576266 + ... + 103042576463.

It is an arithmetic number, because the mean of its divisors is an integer number (2679106985490).

Almost surely, 2^{20402430120171} is an apocalyptic number.

20402430120171 is a deficient number, since it is larger than the sum of its proper divisors (11746853705709).

20402430120171 is a wasteful number, since it uses less digits than its factorization.

20402430120171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206085152746 (or 206085152743 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

Adding to 20402430120171 its reverse (17102103420402), we get a palindrome (37504533540573).

The spelling of 20402430120171 in words is "twenty trillion, four hundred two billion, four hundred thirty million, one hundred twenty thousand, one hundred seventy-one".