20444223728 has 40 divisors (see below), whose sum is σ = 42298423680. Its totient is φ = 9551243520.

The previous prime is 20444223703. The next prime is 20444223781. The reversal of 20444223728 is 82732244402.

It is a junction number, because it is equal to n+sod(n) for n = 20444223691 and 20444223700.

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 7 ways as a sum of consecutive naturals, for example, 696275 + ... + 725042.

It is an arithmetic number, because the mean of its divisors is an integer number (1057460592).

Almost surely, 2^20444223728 is an apocalyptic number.

It is an amenable number.

20444223728 is an abundant number, since it is smaller than the sum of its proper divisors (21854199952).

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

20444223728 is a wasteful number, since it uses less digits than its factorization.

20444223728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421385 (or 1421379 counting only the distinct ones).

The product of its (nonzero) digits is 172032, while the sum is 38.

The spelling of 20444223728 in words is "twenty billion, four hundred forty-four million, two hundred twenty-three thousand, seven hundred twenty-eight".