20004003 has 24 divisors (see below), whose sum is σ = 30191616. Its totient is φ = 13235400.

The previous prime is 20004001. The next prime is 20004011. The reversal of 20004003 is 30040002.

It is not a de Polignac number, because 20004003 - 2¹ = 20004001 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46198 + ... + 46628.

It is an arithmetic number, because the mean of its divisors is an integer number (1257984).

Almost surely, 2^20004003 is an apocalyptic number.

20004003 is a deficient number, since it is larger than the sum of its proper divisors (10187613).

20004003 is an equidigital number, since it uses as much as digits as its factorization.

20004003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 625 counting only the distinct ones).

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

The square root of 20004003 is about 4472.5834816133. The cubic root of 20004003 is about 271.4598701409.

Adding to 20004003 its reverse (30040002), we get a palindrome (50044005).

The spelling of 20004003 in words is "twenty million, four thousand, three".