20113133065 has 4 divisors (see below), whose sum is σ = 24135759684. Its totient is φ = 16090506448.

The previous prime is 20113133063. The next prime is 20113133093. The reversal of 20113133065 is 56033131102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4217723136 + 15895409929 = 64944^2 + 126077^2 .

It is a cyclic number.

It is not a de Polignac number, because 20113133065 - 2¹ = 20113133063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20113133063) 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, 2011313302 + ... + 2011313311.

It is an arithmetic number, because the mean of its divisors is an integer number (6033939921).

Almost surely, 2^20113133065 is an apocalyptic number.

It is an amenable number.

20113133065 is a deficient number, since it is larger than the sum of its proper divisors (4022626619).

20113133065 is an equidigital number, since it uses as much as digits as its factorization.

20113133065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022626618.

The product of its (nonzero) digits is 1620, while the sum is 25.

Adding to 20113133065 its reverse (56033131102), we get a palindrome (76146264167).

The spelling of 20113133065 in words is "twenty billion, one hundred thirteen million, one hundred thirty-three thousand, sixty-five".