20545130171 has 4 divisors (see below), whose sum is σ = 20546955000. Its totient is φ = 20543305344.

The previous prime is 20545130161. The next prime is 20545130189. The reversal of 20545130171 is 17103154502.

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 20545130171 - 2⁶ = 20545130107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545130131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 895421 + ... + 918078.

It is an arithmetic number, because the mean of its divisors is an integer number (5136738750).

Almost surely, 2^20545130171 is an apocalyptic number.

20545130171 is a deficient number, since it is larger than the sum of its proper divisors (1824829).

20545130171 is a wasteful number, since it uses less digits than its factorization.

20545130171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824828.

The product of its (nonzero) digits is 4200, while the sum is 29.

Adding to 20545130171 its reverse (17103154502), we get a palindrome (37648284673).

The spelling of 20545130171 in words is "twenty billion, five hundred forty-five million, one hundred thirty thousand, one hundred seventy-one".