20440003 has 4 divisors (see below), whose sum is σ = 20454400. Its totient is φ = 20425608.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440003 is 30004402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30004402 = 2 ⋅15002201.

It is a cyclic number.

It is not a de Polignac number, because 20440003 - 2¹³ = 20431811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20440703) 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, 4803 + ... + 7996.

It is an arithmetic number, because the mean of its divisors is an integer number (5113600).

Almost surely, 2^20440003 is an apocalyptic number.

20440003 is a deficient number, since it is larger than the sum of its proper divisors (14397).

20440003 is a wasteful number, since it uses less digits than its factorization.

20440003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14396.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 20440003 is about 4521.0621539634. The cubic root of 20440003 is about 273.4179262593.

Adding to 20440003 its reverse (30004402), we get a palindrome (50444405).

The spelling of 20440003 in words is "twenty million, four hundred forty thousand, three".