20400044111 has 4 divisors (see below), whose sum is σ = 20407132800. Its totient is φ = 20392955424.

The previous prime is 20400044099. The next prime is 20400044117. The reversal of 20400044111 is 11144000402.

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-20400044111 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 20400044111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20400044117) 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, 3540026 + ... + 3545783.

It is an arithmetic number, because the mean of its divisors is an integer number (5101783200).

Almost surely, 2^20400044111 is an apocalyptic number.

20400044111 is a deficient number, since it is larger than the sum of its proper divisors (7088689).

20400044111 is an equidigital number, since it uses as much as digits as its factorization.

20400044111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7088688.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20400044111 its reverse (11144000402), we get a palindrome (31544044513).

The spelling of 20400044111 in words is "twenty billion, four hundred million, forty-four thousand, one hundred eleven".