20641135056 has 80 divisors (see below), whose sum is σ = 53851374720. Its totient is φ = 6812323840.

The previous prime is 20641134991. The next prime is 20641135057. The reversal of 20641135056 is 65053114602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20641135057) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8454796 + ... + 8457236.

It is an arithmetic number, because the mean of its divisors is an integer number (673142184).

Almost surely, 2^20641135056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20641135056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26925687360).

20641135056 is an abundant number, since it is smaller than the sum of its proper divisors (33210239664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20641135056 is a wasteful number, since it uses less digits than its factorization.

20641135056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4124 (or 4118 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 20641135056 its reverse (65053114602), we get a palindrome (85694249658).

The spelling of 20641135056 in words is "twenty billion, six hundred forty-one million, one hundred thirty-five thousand, fifty-six".