20002003 has 16 divisors (see below), whose sum is σ = 24480000. Its totient is φ = 15960672.

The previous prime is 20001983. The next prime is 20002007. The reversal of 20002003 is 30020002.

It is not a de Polignac number, because 20002003 - 2⁹ = 20001491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20002007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6573 + ... + 9121.

It is an arithmetic number, because the mean of its divisors is an integer number (1530000).

Almost surely, 2^20002003 is an apocalyptic number.

20002003 is a deficient number, since it is larger than the sum of its proper divisors (4477997).

20002003 is a wasteful number, since it uses less digits than its factorization.

20002003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634.

The product of its (nonzero) digits is 12, while the sum is 7.

The square root of 20002003 is about 4472.3598916009. The cubic root of 20002003 is about 271.4508229878.

Adding to 20002003 its reverse (30020002), we get a palindrome (50022005).

The spelling of 20002003 in words is "twenty million, two thousand, three".