20448121736 has 64 divisors (see below), whose sum is σ = 44415744000. Its totient is φ = 8644034880.

The previous prime is 20448121721. The next prime is 20448121741. The reversal of 20448121736 is 63712184402.

It is a self number, because there is not a number n which added to its sum of digits gives 20448121736.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6771635 + ... + 6774653.

It is an arithmetic number, because the mean of its divisors is an integer number (693996000).

Almost surely, 2^20448121736 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 20448121736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22207872000).

20448121736 is an abundant number, since it is smaller than the sum of its proper divisors (23967622264).

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

20448121736 is a wasteful number, since it uses less digits than its factorization.

20448121736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4642 (or 4638 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 20448121736 in words is "twenty billion, four hundred forty-eight million, one hundred twenty-one thousand, seven hundred thirty-six".