20660271 has 4 divisors (see below), whose sum is σ = 27547032. Its totient is φ = 13773512.

The previous prime is 20660261. The next prime is 20660303. The reversal of 20660271 is 17206602.

It is a happy number.

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 20660271 - 2⁹ = 20659759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660231) 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, 3443376 + ... + 3443381.

It is an arithmetic number, because the mean of its divisors is an integer number (6886758).

Almost surely, 2^20660271 is an apocalyptic number.

20660271 is a deficient number, since it is larger than the sum of its proper divisors (6886761).

20660271 is an equidigital number, since it uses as much as digits as its factorization.

20660271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6886760.

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 20660271 is about 4545.3570816824. The cubic root of 20660271 is about 274.3965655533.

Adding to 20660271 its reverse (17206602), we get a palindrome (37866873).

The spelling of 20660271 in words is "twenty million, six hundred sixty thousand, two hundred seventy-one".