20011011011 has 4 divisors (see below), whose sum is σ = 20881054992. Its totient is φ = 19140967032.

The previous prime is 20011011001. The next prime is 20011011073. The reversal of 20011011011 is 11011011002.

It is a happy number.

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 20011011011 - 2¹⁰ = 20011009987 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 20011011011.

It is not an unprimeable number, because it can be changed into a prime (20011011001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435021956 + ... + 435022001.

It is an arithmetic number, because the mean of its divisors is an integer number (5220263748).

Almost surely, 2^20011011011 is an apocalyptic number.

20011011011 is a deficient number, since it is larger than the sum of its proper divisors (870043981).

20011011011 is an equidigital number, since it uses as much as digits as its factorization.

20011011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870043980.

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 20011011011 its reverse (11011011002), we get a palindrome (31022022013).

Subtracting from 20011011011 its reverse (11011011002), we obtain a palindrome (9000000009).

The spelling of 20011011011 in words is "twenty billion, eleven million, eleven thousand, eleven".