20511443061133 has 8 divisors (see below), whose sum is σ = 20535881956920. Its totient is φ = 20487017456640.

The previous prime is 20511443061127. The next prime is 20511443061211. The reversal of 20511443061133 is 33116034411502.

It can be written as a sum of positive squares in 4 ways, for example, as 54972429444 + 20456470631689 = 234462^2 + 4522883^2 .

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-20511443061133 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 (20511443011133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232828 + ... + 6409141.

It is an arithmetic number, because the mean of its divisors is an integer number (2566985244615).

Almost surely, 2^{20511443061133} is an apocalyptic number.

It is an amenable number.

20511443061133 is a deficient number, since it is larger than the sum of its proper divisors (24438895787).

20511443061133 is a wasteful number, since it uses less digits than its factorization.

20511443061133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6645647.

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 20511443061133 its reverse (33116034411502), we get a palindrome (53627477472635).

The spelling of 20511443061133 in words is "twenty trillion, five hundred eleven billion, four hundred forty-three million, sixty-one thousand, one hundred thirty-three".