18020089 has 2 divisors, whose sum is σ = 18020090. Its totient is φ = 18020088.

The previous prime is 18020087. The next prime is 18020111. The reversal of 18020089 is 98002081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 64 = 4245^2 + 8^2 .

It is a cyclic number.

It is not a de Polignac number, because 18020089 - 2¹ = 18020087 is a prime.

Together with 18020087, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18020081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010044 + 9010045.

It is an arithmetic number, because the mean of its divisors is an integer number (9010045).

Almost surely, 2^18020089 is an apocalyptic number.

It is an amenable number.

18020089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18020089 is an equidigital number, since it uses as much as digits as its factorization.

18020089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18020089 is about 4245.0075382736. The cubic root of 18020089 is about 262.1715996060.

The spelling of 18020089 in words is "eighteen million, twenty thousand, eighty-nine".