20444447968 has 72 divisors (see below), whose sum is σ = 46853586864. Its totient is φ = 8755891200.

The previous prime is 20444447923. The next prime is 20444447981. The reversal of 20444447968 is 86974444402.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 2867448 + ... + 2874568.

It is an arithmetic number, because the mean of its divisors is an integer number (650744262).

Almost surely, 2^20444447968 is an apocalyptic number.

20444447968 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20444447968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23426793432).

20444447968 is an abundant number, since it is smaller than the sum of its proper divisors (26409138896).

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

20444447968 is a wasteful number, since it uses less digits than its factorization.

20444447968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8976 (or 8961 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 52.

The spelling of 20444447968 in words is "twenty billion, four hundred forty-four million, four hundred forty-seven thousand, nine hundred sixty-eight".