20441609 has 4 divisors (see below), whose sum is σ = 20671380. Its totient is φ = 20211840.

The previous prime is 20441593. The next prime is 20441611. The reversal of 20441609 is 90614402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9859600 + 10582009 = 3140^2 + 3253^2 .

It is a cyclic number.

It is not a de Polignac number, because 20441609 - 2⁴ = 20441593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20441639) 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 in 3 ways as a sum of consecutive naturals, for example, 114752 + ... + 114929.

It is an arithmetic number, because the mean of its divisors is an integer number (5167845).

Almost surely, 2^20441609 is an apocalyptic number.

It is an amenable number.

20441609 is a deficient number, since it is larger than the sum of its proper divisors (229771).

20441609 is an equidigital number, since it uses as much as digits as its factorization.

20441609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229770.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20441609 is about 4521.2397636047. The cubic root of 20441609 is about 273.4250870164.

The spelling of 20441609 in words is "twenty million, four hundred forty-one thousand, six hundred nine".