20040003 has 12 divisors (see below), whose sum is σ = 30470440. Its totient is φ = 12656736.

The previous prime is 20039993. The next prime is 20040049. The reversal of 20040003 is 30004002.

It is not a de Polignac number, because 20040003 - 2¹⁰ = 20038979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20040203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58426 + ... + 58767.

Almost surely, 2^20040003 is an apocalyptic number.

20040003 is a deficient number, since it is larger than the sum of its proper divisors (10430437).

20040003 is a wasteful number, since it uses less digits than its factorization.

20040003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117218 (or 117215 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 20040003 is about 4476.6061921952. The cubic root of 20040003 is about 271.6226158810.

Adding to 20040003 its reverse (30004002), we get a palindrome (50044005).

The spelling of 20040003 in words is "twenty million, forty thousand, three".