20116871 has 2 divisors, whose sum is σ = 20116872. Its totient is φ = 20116870.

The previous prime is 20116853. The next prime is 20116891. The reversal of 20116871 is 17861102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20116871 - 2²² = 15922567 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 20116871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20116841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058435 + 10058436.

It is an arithmetic number, because the mean of its divisors is an integer number (10058436).

Almost surely, 2^20116871 is an apocalyptic number.

20116871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116871 is an equidigital number, since it uses as much as digits as its factorization.

20116871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 20116871 is about 4485.1834968037. The cubic root of 20116871 is about 271.9694629429.

Adding to 20116871 its reverse (17861102), we get a palindrome (37977973).

The spelling of 20116871 in words is "twenty million, one hundred sixteen thousand, eight hundred seventy-one".