20403589 has 2 divisors, whose sum is σ = 20403590. Its totient is φ = 20403588.

The previous prime is 20403541. The next prime is 20403709. The reversal of 20403589 is 98530402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18922500 + 1481089 = 4350^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403589 - 2¹⁵ = 20370821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20403589.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20403389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10201794 + 10201795.

It is an arithmetic number, because the mean of its divisors is an integer number (10201795).

Almost surely, 2^20403589 is an apocalyptic number.

It is an amenable number.

20403589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20403589 is an equidigital number, since it uses as much as digits as its factorization.

20403589 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 20403589 is about 4517.0332077593. The cubic root of 20403589 is about 273.2554644665.

The spelling of 20403589 in words is "twenty million, four hundred three thousand, five hundred eighty-nine".