20006871 has 4 divisors (see below), whose sum is σ = 26675832. Its totient is φ = 13337912.

The previous prime is 20006869. The next prime is 20006881. The reversal of 20006871 is 17860002.

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 20006871 - 2¹ = 20006869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20006801) 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, 3334476 + ... + 3334481.

It is an arithmetic number, because the mean of its divisors is an integer number (6668958).

Almost surely, 2^20006871 is an apocalyptic number.

20006871 is a deficient number, since it is larger than the sum of its proper divisors (6668961).

20006871 is an equidigital number, since it uses as much as digits as its factorization.

20006871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6668960.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20006871 is about 4472.9040901857. The cubic root of 20006871 is about 271.4728427062.

Adding to 20006871 its reverse (17860002), we get a palindrome (37866873).

The spelling of 20006871 in words is "twenty million, six thousand, eight hundred seventy-one".