20016399819636 has 240 divisors, whose sum is σ = 60460527980160. Its totient is φ = 5706996756480.

The previous prime is 20016399819629. The next prime is 20016399819641. The reversal of 20016399819636 is 63691899361002.

20016399819636 is a `hidden beast` number, since 20 + 0 + 1 + 6 + 399 + 8 + 196 + 36 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 200678185 + ... + 200777903.

It is an arithmetic number, because the mean of its divisors is an integer number (251918866584).

Almost surely, 2^{20016399819636} 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 20016399819636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30230263990080).

20016399819636 is an abundant number, since it is smaller than the sum of its proper divisors (40444128160524).

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

20016399819636 is a wasteful number, since it uses less digits than its factorization.

20016399819636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103076 (or 103065 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The spelling of 20016399819636 in words is "twenty trillion, sixteen billion, three hundred ninety-nine million, eight hundred nineteen thousand, six hundred thirty-six".