20216636137056 has 192 divisors, whose sum is σ = 55958488588800. Its totient is φ = 6378109157376.

The previous prime is 20216636137051. The next prime is 20216636137099. The reversal of 20216636137056 is 65073163661202.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 20216636136996 and 20216636137014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20216636137051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1848119235 + ... + 1848130173.

It is an arithmetic number, because the mean of its divisors is an integer number (291450461400).

Almost surely, 2^{20216636137056} 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 20216636137056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27979244294400).

20216636137056 is an abundant number, since it is smaller than the sum of its proper divisors (35741852451744).

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

20216636137056 is a wasteful number, since it uses less digits than its factorization.

20216636137056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19701 (or 19693 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 48.

Adding to 20216636137056 its reverse (65073163661202), we get a palindrome (85289799798258).

The spelling of 20216636137056 in words is "twenty trillion, two hundred sixteen billion, six hundred thirty-six million, one hundred thirty-seven thousand, fifty-six".