20112011 has 8 divisors (see below), whose sum is σ = 20546544. Its totient is φ = 19681920.

The previous prime is 20112007. The next prime is 20112023. The reversal of 20112011 is 11021102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20112011 - 2² = 20112007 is a prime.

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 20112011.

It is not an unprimeable number, because it can be changed into a prime (20112031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8996 + ... + 11006.

It is an arithmetic number, because the mean of its divisors is an integer number (2568318).

Almost surely, 2^20112011 is an apocalyptic number.

20112011 is a deficient number, since it is larger than the sum of its proper divisors (434533).

20112011 is a wasteful number, since it uses less digits than its factorization.

20112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 20112011 is about 4484.6416802237. The cubic root of 20112011 is about 271.9475596352.

Adding to 20112011 its reverse (11021102), we get a palindrome (31133113).

Subtracting from 20112011 its reverse (11021102), we obtain a palindrome (9090909).

The spelling of 20112011 in words is "twenty million, one hundred twelve thousand, eleven".