20113231 has 2 divisors, whose sum is σ = 20113232. Its totient is φ = 20113230.

The previous prime is 20113217. The next prime is 20113253. The reversal of 20113231 is 13231102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20113231 - 2¹¹ = 20111183 is a prime.

It is a super-2 number, since 2×20113231² = 809084122518722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20113271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056615 + 10056616.

It is an arithmetic number, because the mean of its divisors is an integer number (10056616).

Almost surely, 2^20113231 is an apocalyptic number.

20113231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20113231 is an equidigital number, since it uses as much as digits as its factorization.

20113231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 20113231 is about 4484.7776979467. Note that the first 3 decimals coincide. The cubic root of 20113231 is about 271.9530583281.

Adding to 20113231 its reverse (13231102), we get a palindrome (33344333).

The spelling of 20113231 in words is "twenty million, one hundred thirteen thousand, two hundred thirty-one".