20443539168 has 144 divisors (see below), whose sum is σ = 62780477760. Its totient is φ = 6273027072.

The previous prime is 20443539133. The next prime is 20443539169. The reversal of 20443539168 is 86193534402.

20443539168 is a `hidden beast` number, since 20 + 4 + 435 + 39 + 168 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20443539169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1389193 + ... + 1403831.

It is an arithmetic number, because the mean of its divisors is an integer number (435975540).

Almost surely, 2^20443539168 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 20443539168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31390238880).

20443539168 is an abundant number, since it is smaller than the sum of its proper divisors (42336938592).

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

20443539168 is a wasteful number, since it uses less digits than its factorization.

20443539168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15041 (or 15030 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 20443539168 in words is "twenty billion, four hundred forty-three million, five hundred thirty-nine thousand, one hundred sixty-eight".