20986484918784 has 320 divisors, whose sum is σ = 71405251771392. Its totient is φ = 5318081740800.

The previous prime is 20986484918747. The next prime is 20986484918809. The reversal of 20986484918784 is 48781948468902.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2685219 + ... + 7013085.

Almost surely, 2^{20986484918784} is an apocalyptic number.

20986484918784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20986484918784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35702625885696).

20986484918784 is an abundant number, since it is smaller than the sum of its proper divisors (50418766852608).

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

20986484918784 is a wasteful number, since it uses less digits than its factorization.

20986484918784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4327947 (or 4327931 counting only the distinct ones).

The product of its (nonzero) digits is 1783627776, while the sum is 78.

The spelling of 20986484918784 in words is "twenty trillion, nine hundred eighty-six billion, four hundred eighty-four million, nine hundred eighteen thousand, seven hundred eighty-four".