20444221720 has 32 divisors (see below), whose sum is σ = 49537923120. Its totient is φ = 7548635520.

The previous prime is 20444221697. The next prime is 20444221729. The reversal of 20444221720 is 2712244402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20444221729) 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, 19657386 + ... + 19658425.

Almost surely, 2^20444221720 is an apocalyptic number.

20444221720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20444221720 is an abundant number, since it is smaller than the sum of its proper divisors (29093701400).

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

20444221720 is a wasteful number, since it uses less digits than its factorization.

20444221720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39315835 (or 39315831 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 28.

The spelling of 20444221720 in words is "twenty billion, four hundred forty-four million, two hundred twenty-one thousand, seven hundred twenty".