20111120065 has 8 divisors (see below), whose sum is σ = 24238731240. Its totient is φ = 16018637952.

The previous prime is 20111120053. The next prime is 20111120083. The reversal of 20111120065 is 56002111102.

It can be written as a sum of positive squares in 4 ways, for example, as 7466342464 + 12644777601 = 86408^2 + 112449^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111120065 is a prime.

It is an unprimeable number.

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, 8781004 + ... + 8783293.

It is an arithmetic number, because the mean of its divisors is an integer number (3029841405).

Almost surely, 2^20111120065 is an apocalyptic number.

It is an amenable number.

20111120065 is a deficient number, since it is larger than the sum of its proper divisors (4127611175).

20111120065 is a wasteful number, since it uses less digits than its factorization.

20111120065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17564531.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 20111120065 its reverse (56002111102), we get a palindrome (76113231167).

The spelling of 20111120065 in words is "twenty billion, one hundred eleven million, one hundred twenty thousand, sixty-five".