20384457444 has 144 divisors (see below), whose sum is σ = 59019262848. Its totient is φ = 5876665344.

The previous prime is 20384457421. The next prime is 20384457473. The reversal of 20384457444 is 44475448302.

20384457444 is a `hidden beast` number, since 2 + 0 + 38 + 4 + 4 + 574 + 44 = 666.

It is a super-2 number, since 2×20384457444² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20384457444.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1800369 + ... + 1811655.

It is an arithmetic number, because the mean of its divisors is an integer number (409855992).

Almost surely, 2^20384457444 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 20384457444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29509631424).

20384457444 is an abundant number, since it is smaller than the sum of its proper divisors (38634805404).

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

20384457444 is a wasteful number, since it uses less digits than its factorization.

20384457444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11554 (or 11549 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 45.

The spelling of 20384457444 in words is "twenty billion, three hundred eighty-four million, four hundred fifty-seven thousand, four hundred forty-four".