20011012011 has 40 divisors (see below), whose sum is σ = 30572382720. Its totient is φ = 13038287472.

The previous prime is 20011011961. The next prime is 20011012019. The reversal of 20011012011 is 11021011002.

It is a happy number.

It is not a de Polignac number, because 20011012011 - 2⁹ = 20011011499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20011011984 and 20011012002.

It is not an unprimeable number, because it can be changed into a prime (20011012019) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2992770 + ... + 2999448.

It is an arithmetic number, because the mean of its divisors is an integer number (764309568).

Almost surely, 2^20011012011 is an apocalyptic number.

20011012011 is a deficient number, since it is larger than the sum of its proper divisors (10561370709).

20011012011 is an equidigital number, since it uses as much as digits as its factorization.

20011012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7525 (or 7516 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20011012011 its reverse (11021011002), we get a palindrome (31032023013).

The spelling of 20011012011 in words is "twenty billion, eleven million, twelve thousand, eleven".