20542589 has 2 divisors, whose sum is σ = 20542590. Its totient is φ = 20542588.

The previous prime is 20542573. The next prime is 20542603. The reversal of 20542589 is 98524502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17056900 + 3485689 = 4130^2 + 1867^2 .

It is a cyclic number.

It is not a de Polignac number, because 20542589 - 2⁴ = 20542573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20542559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271294 + 10271295.

It is an arithmetic number, because the mean of its divisors is an integer number (10271295).

Almost surely, 2^20542589 is an apocalyptic number.

It is an amenable number.

20542589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20542589 is an equidigital number, since it uses as much as digits as its factorization.

20542589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 20542589 is about 4532.3932971445. The cubic root of 20542589 is about 273.8745807445.

The spelling of 20542589 in words is "twenty million, five hundred forty-two thousand, five hundred eighty-nine".