20844988416 has 480 divisors, whose sum is σ = 73729656000. Its totient is φ = 5741051904.

The previous prime is 20844988357. The next prime is 20844988429. The reversal of 20844988416 is 61488944802.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 33674955 + ... + 33675573.

It is an arithmetic number, because the mean of its divisors is an integer number (153603450).

Almost surely, 2^20844988416 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 20844988416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36864828000).

20844988416 is an abundant number, since it is smaller than the sum of its proper divisors (52884667584).

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

20844988416 is an equidigital number, since it uses as much as digits as its factorization.

20844988416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 54.

The spelling of 20844988416 in words is "twenty billion, eight hundred forty-four million, nine hundred eighty-eight thousand, four hundred sixteen".