20657001171 has 8 divisors (see below), whose sum is σ = 27639993280. Its totient is φ = 13722671592.

The previous prime is 20657001151. The next prime is 20657001179. The reversal of 20657001171 is 17110075602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20657001171 - 2¹⁴ = 20656984787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20657001179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12164641 + ... + 12166338.

It is an arithmetic number, because the mean of its divisors is an integer number (3454999160).

Almost surely, 2^20657001171 is an apocalyptic number.

20657001171 is a deficient number, since it is larger than the sum of its proper divisors (6982992109).

20657001171 is a wasteful number, since it uses less digits than its factorization.

20657001171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24331265.

The product of its (nonzero) digits is 2940, while the sum is 30.

Adding to 20657001171 its reverse (17110075602), we get a palindrome (37767076773).

The spelling of 20657001171 in words is "twenty billion, six hundred fifty-seven million, one thousand, one hundred seventy-one".