20011001111 has 8 divisors (see below), whose sum is σ = 20054560800. Its totient is φ = 19967472000.

The previous prime is 20011001093. The next prime is 20011001137. The reversal of 20011001111 is 11110011002.

It is a happy number.

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 20011001111 - 2¹⁴ = 20010984727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011001711) 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 7 ways as a sum of consecutive naturals, for example, 1701710 + ... + 1713428.

It is an arithmetic number, because the mean of its divisors is an integer number (2506820100).

Almost surely, 2^20011001111 is an apocalyptic number.

20011001111 is a deficient number, since it is larger than the sum of its proper divisors (43559689).

20011001111 is a wasteful number, since it uses less digits than its factorization.

20011001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15289.

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

Adding to 20011001111 its reverse (11110011002), we get a palindrome (31121012113).

The spelling of 20011001111 in words is "twenty billion, eleven million, one thousand, one hundred eleven".