20012003 has 4 divisors (see below), whose sum is σ = 21831288. Its totient is φ = 18192720.

The previous prime is 20011993. The next prime is 20012011. The reversal of 20012003 is 30021002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20012003 - 2⁴ = 20011987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909626 + ... + 909647.

It is an arithmetic number, because the mean of its divisors is an integer number (5457822).

Almost surely, 2^20012003 is an apocalyptic number.

20012003 is a deficient number, since it is larger than the sum of its proper divisors (1819285).

20012003 is a wasteful number, since it uses less digits than its factorization.

20012003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819284.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 20012003 is about 4473.4777299099. The cubic root of 20012003 is about 271.4960527244.

Adding to 20012003 its reverse (30021002), we get a palindrome (50033005).

It can be divided in two parts, 2001 and 2003, that added together give a palindrome (4004).

The spelling of 20012003 in words is "twenty million, twelve thousand, three".