20005443 has 12 divisors (see below), whose sum is σ = 28938520. Its totient is φ = 13317696.

The previous prime is 20005441. The next prime is 20005451. The reversal of 20005443 is 34450002.

It is a happy number.

It is not a de Polignac number, because 20005443 - 2¹ = 20005441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20005441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7980 + ... + 10182.

Almost surely, 2^20005443 is an apocalyptic number.

20005443 is a deficient number, since it is larger than the sum of its proper divisors (8933077).

20005443 is a wasteful number, since it uses less digits than its factorization.

20005443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3218 (or 3215 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20005443 is about 4472.7444595013. The cubic root of 20005443 is about 271.4663837178.

Adding to 20005443 its reverse (34450002), we get a palindrome (54455445).

The spelling of 20005443 in words is "twenty million, five thousand, four hundred forty-three".