20005003 has 2 divisors, whose sum is σ = 20005004. Its totient is φ = 20005002.

The previous prime is 20004997. The next prime is 20005021. The reversal of 20005003 is 30050002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20005003 is a prime.

It is not a weakly prime, because it can be changed into another prime (20005093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002501 + 10002502.

It is an arithmetic number, because the mean of its divisors is an integer number (10002502).

Almost surely, 2^20005003 is an apocalyptic number.

20005003 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005003 is an equidigital number, since it uses as much as digits as its factorization.

20005003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30, while the sum is 10.

The square root of 20005003 is about 4472.6952724280. The cubic root of 20005003 is about 271.4643934914.

Adding to 20005003 its reverse (30050002), we get a palindrome (50055005).

The spelling of 20005003 in words is "twenty million, five thousand, three".