20430589 has 2 divisors, whose sum is σ = 20430590. Its totient is φ = 20430588.

The previous prime is 20430577. The next prime is 20430607. The reversal of 20430589 is 98503402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17081689 + 3348900 = 4133^2 + 1830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20430589 - 2⁹ = 20430077 is a prime.

It is equal to p_1296148 and since 20430589 and 1296148 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20430589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20430539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215294 + 10215295.

It is an arithmetic number, because the mean of its divisors is an integer number (10215295).

Almost surely, 2^20430589 is an apocalyptic number.

It is an amenable number.

20430589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20430589 is an equidigital number, since it uses as much as digits as its factorization.

20430589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20430589 is about 4520.0209070313. The cubic root of 20430589 is about 273.3759440146.

The spelling of 20430589 in words is "twenty million, four hundred thirty thousand, five hundred eighty-nine".