20833728 has 56 divisors (see below), whose sum is σ = 58033920. Its totient is φ = 6577920.

The previous prime is 20833723. The next prime is 20833759. The reversal of 20833728 is 82733802.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20833723) by changing a digit.

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, 793 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1036320).

Almost surely, 2^20833728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20833728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29016960).

20833728 is an abundant number, since it is smaller than the sum of its proper divisors (37200192).

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

20833728 is a wasteful number, since it uses less digits than its factorization.

20833728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5745 (or 5735 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 20833728 is about 4564.3978792388. The cubic root of 20833728 is about 275.1623416111.

The spelling of 20833728 in words is "twenty million, eight hundred thirty-three thousand, seven hundred twenty-eight".