20601571818056 has 64 divisors (see below), whose sum is σ = 41936089895280. Its totient is φ = 9449740984320.

The previous prime is 20601571818041. The next prime is 20601571818059. The reversal of 20601571818056 is 65081817510602.

It can be written as a sum of positive squares in 8 ways, for example, as 12098807415556 + 8502764402500 = 3478334^2 + 2915950^2 .

It is a super-2 number, since 2×20601571818056² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20601571817995 and 20601571818013.

It is not an unprimeable number, because it can be changed into a prime (20601571818059) 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, 4404410 + ... + 7784726.

Almost surely, 2^{20601571818056} is an apocalyptic number.

It is an amenable number.

20601571818056 is an abundant number, since it is smaller than the sum of its proper divisors (21334518077224).

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

20601571818056 is a wasteful number, since it uses less digits than its factorization.

20601571818056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381474 (or 3381470 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 50.

The spelling of 20601571818056 in words is "twenty trillion, six hundred one billion, five hundred seventy-one million, eight hundred eighteen thousand, fifty-six".