20116289 has 2 divisors, whose sum is σ = 20116290. Its totient is φ = 20116288.

The previous prime is 20116279. The next prime is 20116301. The reversal of 20116289 is 98261102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 1669264 = 4295^2 + 1292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20116289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20116249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058144 + 10058145.

It is an arithmetic number, because the mean of its divisors is an integer number (10058145).

Almost surely, 2^20116289 is an apocalyptic number.

It is an amenable number.

20116289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116289 is an equidigital number, since it uses as much as digits as its factorization.

20116289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 20116289 is about 4485.1186160457. The cubic root of 20116289 is about 271.9668401401.

The spelling of 20116289 in words is "twenty million, one hundred sixteen thousand, two hundred eighty-nine".