20244728 has 64 divisors (see below), whose sum is σ = 46656000. Its totient is φ = 8042112.

The previous prime is 20244713. The next prime is 20244751. The reversal of 20244728 is 82744202.

It is a self number, because there is not a number n which added to its sum of digits gives 20244728.

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 15 ways as a sum of consecutive naturals, for example, 56213 + ... + 56571.

It is an arithmetic number, because the mean of its divisors is an integer number (729000).

Almost surely, 2^20244728 is an apocalyptic number.

20244728 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 20244728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23328000).

20244728 is an abundant number, since it is smaller than the sum of its proper divisors (26411272).

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

20244728 is a wasteful number, since it uses less digits than its factorization.

20244728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 20244728 is about 4499.4141840911. The cubic root of 20244728 is about 272.5444328971.

The spelling of 20244728 in words is "twenty million, two hundred forty-four thousand, seven hundred twenty-eight".