20111227 has 4 divisors (see below), whose sum is σ = 20180160. Its totient is φ = 20042296.

The previous prime is 20111213. The next prime is 20111243. The reversal of 20111227 is 72211102.

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 20111227 - 2¹⁹ = 19586939 is a prime.

It is a super-2 number, since 2×20111227² = 808922902891058, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111227.

It is not an unprimeable number, because it can be changed into a prime (20111257) 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, 34027 + ... + 34612.

It is an arithmetic number, because the mean of its divisors is an integer number (5045040).

Almost surely, 2^20111227 is an apocalyptic number.

20111227 is a deficient number, since it is larger than the sum of its proper divisors (68933).

20111227 is an equidigital number, since it uses as much as digits as its factorization.

20111227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68932.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 20111227 is about 4484.5542699359. The cubic root of 20111227 is about 271.9440259316.

Adding to 20111227 its reverse (72211102), we get a palindrome (92322329).

The spelling of 20111227 in words is "twenty million, one hundred eleven thousand, two hundred twenty-seven".