20111356 has 12 divisors (see below), whose sum is σ = 35232120. Its totient is φ = 10045040.

The previous prime is 20111317. The next prime is 20111359. The reversal of 20111356 is 65311102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (2936010).

Almost surely, 2^20111356 is an apocalyptic number.

It is an amenable number.

20111356 is a deficient number, since it is larger than the sum of its proper divisors (15120764).

20111356 is a wasteful number, since it uses less digits than its factorization.

20111356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5324 (or 5322 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 20111356 is about 4484.5686526131. The cubic root of 20111356 is about 271.9446073764.

Adding to 20111356 its reverse (65311102), we get a palindrome (85422458).

The spelling of 20111356 in words is "twenty million, one hundred eleven thousand, three hundred fifty-six".