20011002011 has 16 divisors (see below), whose sum is σ = 26867920128. Its totient is φ = 14393527200.

The previous prime is 20011002007. The next prime is 20011002031. The reversal of 20011002011 is 11020011002.

It is not a de Polignac number, because 20011002011 - 2² = 20011002007 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20011002011.

It is not an unprimeable number, because it can be changed into a prime (20011002031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9994505 + ... + 9996506.

It is an arithmetic number, because the mean of its divisors is an integer number (1679245008).

Almost surely, 2^20011002011 is an apocalyptic number.

20011002011 is a deficient number, since it is larger than the sum of its proper divisors (6856918117).

20011002011 is a wasteful number, since it uses less digits than its factorization.

20011002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19991042.

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

Adding to 20011002011 its reverse (11020011002), we get a palindrome (31031013013).

The spelling of 20011002011 in words is "twenty billion, eleven million, two thousand, eleven".