20008871 has 2 divisors, whose sum is σ = 20008872. Its totient is φ = 20008870.

The previous prime is 20008829. The next prime is 20008903. The reversal of 20008871 is 17880002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20008871 - 2¹⁰ = 20007847 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20008871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20008801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004435 + 10004436.

It is an arithmetic number, because the mean of its divisors is an integer number (10004436).

Almost surely, 2^20008871 is an apocalyptic number.

20008871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20008871 is an equidigital number, since it uses as much as digits as its factorization.

20008871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 20008871 is about 4473.1276529963. The cubic root of 20008871 is about 271.4818883918.

Adding to 20008871 its reverse (17880002), we get a palindrome (37888873).

The spelling of 20008871 in words is "twenty million, eight thousand, eight hundred seventy-one".