20103311 has 16 divisors (see below), whose sum is σ = 22291200. Its totient is φ = 18044928.

The previous prime is 20103301. The next prime is 20103313. The reversal of 20103311 is 11330102.

It is a cyclic number.

It is not a de Polignac number, because 20103311 - 2¹⁸ = 19841167 is a prime.

It is a super-2 number, since 2×20103311² = 808286226325442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20103292 and 20103301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20103313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78095 + ... + 78351.

It is an arithmetic number, because the mean of its divisors is an integer number (1393200).

Almost surely, 2^20103311 is an apocalyptic number.

20103311 is a deficient number, since it is larger than the sum of its proper divisors (2187889).

20103311 is a wasteful number, since it uses less digits than its factorization.

20103311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 20103311 is about 4483.6715981436. The cubic root of 20103311 is about 271.9083411967.

Adding to 20103311 its reverse (11330102), we get a palindrome (31433413).

The spelling of 20103311 in words is "twenty million, one hundred three thousand, three hundred eleven".