20011320011 has 4 divisors (see below), whose sum is σ = 21064547400. Its totient is φ = 18958092624.

The previous prime is 20011319987. The next prime is 20011320029. The reversal of 20011320011 is 11002311002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011320011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011319974 and 20011320001.

It is not an unprimeable number, because it can be changed into a prime (20011320031) 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, 526613666 + ... + 526613703.

It is an arithmetic number, because the mean of its divisors is an integer number (5266136850).

Almost surely, 2^20011320011 is an apocalyptic number.

20011320011 is a deficient number, since it is larger than the sum of its proper divisors (1053227389).

20011320011 is a wasteful number, since it uses less digits than its factorization.

20011320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053227388.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20011320011 its reverse (11002311002), we get a palindrome (31013631013).

Subtracting from 20011320011 its reverse (11002311002), we obtain a palindrome (9009009009).

The spelling of 20011320011 in words is "twenty billion, eleven million, three hundred twenty thousand, eleven".