20387089 has 2 divisors, whose sum is σ = 20387090. Its totient is φ = 20387088.

The previous prime is 20387083. The next prime is 20387113. The reversal of 20387089 is 98078302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20322064 + 65025 = 4508^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 20387089 - 2²¹ = 18289937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20387083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10193544 + 10193545.

It is an arithmetic number, because the mean of its divisors is an integer number (10193545).

Almost surely, 2^20387089 is an apocalyptic number.

It is an amenable number.

20387089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387089 is an equidigital number, since it uses as much as digits as its factorization.

20387089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20387089 is about 4515.2064183158. The cubic root of 20387089 is about 273.1817857446.

The spelling of 20387089 in words is "twenty million, three hundred eighty-seven thousand, eighty-nine".