20040445 has 4 divisors (see below), whose sum is σ = 24048540. Its totient is φ = 16032352.

The previous prime is 20040443. The next prime is 20040463. The reversal of 20040445 is 54404002.

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 9523396 + 10517049 = 3086^2 + 3243^2 .

It is a cyclic number.

It is not a de Polignac number, because 20040445 - 2¹ = 20040443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20040443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004040 + ... + 2004049.

It is an arithmetic number, because the mean of its divisors is an integer number (6012135).

Almost surely, 2^20040445 is an apocalyptic number.

It is an amenable number.

20040445 is a deficient number, since it is larger than the sum of its proper divisors (4008095).

20040445 is an equidigital number, since it uses as much as digits as its factorization.

20040445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4008094.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20040445 is about 4476.6555596785. The cubic root of 20040445 is about 271.6246128254.

Adding to 20040445 its reverse (54404002), we get a palindrome (74444447).

The spelling of 20040445 in words is "twenty million, forty thousand, four hundred forty-five".