20003311 has 4 divisors (see below), whose sum is σ = 20019312. Its totient is φ = 19987312.

The previous prime is 20003297. The next prime is 20003317. The reversal of 20003311 is 11330002.

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 20003311 - 2⁹ = 20002799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20003317) 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, 5950 + ... + 8683.

It is an arithmetic number, because the mean of its divisors is an integer number (5004828).

Almost surely, 2^20003311 is an apocalyptic number.

20003311 is a deficient number, since it is larger than the sum of its proper divisors (16001).

20003311 is a wasteful number, since it uses less digits than its factorization.

20003311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 20003311 is about 4472.5061207337. The cubic root of 20003311 is about 271.4567398942.

Adding to 20003311 its reverse (11330002), we get a palindrome (31333313).

The spelling of 20003311 in words is "twenty million, three thousand, three hundred eleven".