20844543472 has 60 divisors (see below), whose sum is σ = 42942683536. Its totient is φ = 9799833600.

The previous prime is 20844543409. The next prime is 20844543491. The reversal of 20844543472 is 27434544802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8326573 + ... + 8329075.

Almost surely, 2^20844543472 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 20844543472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21471341768).

20844543472 is an abundant number, since it is smaller than the sum of its proper divisors (22098140064).

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

20844543472 is a wasteful number, since it uses less digits than its factorization.

20844543472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4346 (or 4323 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 43.

The spelling of 20844543472 in words is "twenty billion, eight hundred forty-four million, five hundred forty-three thousand, four hundred seventy-two".