20440043 has 6 divisors (see below), whose sum is σ = 22133484. Its totient is φ = 18867576.

The previous prime is 20440039. The next prime is 20440109. The reversal of 20440043 is 34004402.

It is not a de Polignac number, because 20440043 - 2² = 20440039 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 60305 + ... + 60642.

It is an arithmetic number, because the mean of its divisors is an integer number (3688914).

Almost surely, 2^20440043 is an apocalyptic number.

20440043 is a deficient number, since it is larger than the sum of its proper divisors (1693441).

20440043 is a wasteful number, since it uses less digits than its factorization.

20440043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120973 (or 120960 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20440043 is about 4521.0665777004. The cubic root of 20440043 is about 273.4181046139.

Adding to 20440043 its reverse (34004402), we get a palindrome (54444445).

The spelling of 20440043 in words is "twenty million, four hundred forty thousand, forty-three".