20130311 has 4 divisors (see below), whose sum is σ = 20143800. Its totient is φ = 20116824.

The previous prime is 20130293. The next prime is 20130343. The reversal of 20130311 is 11303102.

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 20130311 - 2¹⁰ = 20129287 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20130292 and 20130301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20130371) 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 3 ways as a sum of consecutive naturals, for example, 4181 + ... + 7598.

It is an arithmetic number, because the mean of its divisors is an integer number (5035950).

Almost surely, 2^20130311 is an apocalyptic number.

20130311 is a deficient number, since it is larger than the sum of its proper divisors (13489).

20130311 is a wasteful number, since it uses less digits than its factorization.

20130311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13488.

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

The square root of 20130311 is about 4486.6815131007. The cubic root of 20130311 is about 272.0300166917.

Adding to 20130311 its reverse (11303102), we get a palindrome (31433413).

The spelling of 20130311 in words is "twenty million, one hundred thirty thousand, three hundred eleven".