20011003 has 4 divisors (see below), whose sum is σ = 20217400. Its totient is φ = 19804608.

The previous prime is 20011001. The next prime is 20011007. The reversal of 20011003 is 30011002.

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 20011003 - 2¹ = 20011001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011001) 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, 103053 + ... + 103246.

It is an arithmetic number, because the mean of its divisors is an integer number (5054350).

Almost surely, 2^20011003 is an apocalyptic number.

20011003 is a deficient number, since it is larger than the sum of its proper divisors (206397).

20011003 is an equidigital number, since it uses as much as digits as its factorization.

20011003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206396.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 20011003 is about 4473.3659586490. The cubic root of 20011003 is about 271.4915304289.

Adding to 20011003 its reverse (30011002), we get a palindrome (50022005).

Subtracting 20011003 from its reverse (30011002), we obtain a palindrome (9999999).

The spelling of 20011003 in words is "twenty million, eleven thousand, three".