20444389520 has 40 divisors (see below), whose sum is σ = 47539155960. Its totient is φ = 8176732160.

The previous prime is 20444389489. The next prime is 20444389529. The reversal of 20444389520 is 2598344402.

It can be written as a sum of positive squares in 4 ways, for example, as 3113193616 + 17331195904 = 55796^2 + 131648^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (20444389529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1228616 + ... + 1245144.

It is an arithmetic number, because the mean of its divisors is an integer number (1188478899).

Almost surely, 2^20444389520 is an apocalyptic number.

20444389520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20444389520 is an abundant number, since it is smaller than the sum of its proper divisors (27094766440).

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

20444389520 is a wasteful number, since it uses less digits than its factorization.

20444389520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32003 (or 31997 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 20444389520 in words is "twenty billion, four hundred forty-four million, three hundred eighty-nine thousand, five hundred twenty".