20443005 has 24 divisors (see below), whose sum is σ = 38656800. Its totient is φ = 9911520.

The previous prime is 20442997. The next prime is 20443009. The reversal of 20443005 is 50034402.

It is a happy number.

It is not a de Polignac number, because 20443005 - 2³ = 20442997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20155 + ... + 21144.

It is an arithmetic number, because the mean of its divisors is an integer number (1610700).

Almost surely, 2^20443005 is an apocalyptic number.

It is an amenable number.

20443005 is a deficient number, since it is larger than the sum of its proper divisors (18213795).

20443005 is a wasteful number, since it uses less digits than its factorization.

20443005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41321 (or 41318 counting only the distinct ones).

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

The square root of 20443005 is about 4521.3941434031. The cubic root of 20443005 is about 273.4313111307.

Adding to 20443005 its reverse (50034402), we get a palindrome (70477407).

The spelling of 20443005 in words is "twenty million, four hundred forty-three thousand, five".