20013003 has 12 divisors (see below), whose sum is σ = 29189680. Its totient is φ = 13211856.

The previous prime is 20012999. The next prime is 20013031. The reversal of 20013003 is 30031002.

It is a happy number.

It is not a de Polignac number, because 20013003 - 2² = 20012999 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 (20013053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9868 + ... + 11721.

Almost surely, 2^20013003 is an apocalyptic number.

20013003 is a deficient number, since it is larger than the sum of its proper divisors (9176677).

20013003 is a wasteful number, since it uses less digits than its factorization.

20013003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21698 (or 21695 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 9.

The square root of 20013003 is about 4473.5894983782. The cubic root of 20013003 is about 271.5005748693.

Adding to 20013003 its reverse (30031002), we get a palindrome (50044005).

It can be divided in two parts, 200 and 13003, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 20013003 in words is "twenty million, thirteen thousand, three".