20983728 has 80 divisors (see below), whose sum is σ = 57496320. Its totient is φ = 6580992.

The previous prime is 20983727. The next prime is 20983741. The reversal of 20983728 is 82738902.

It is not an unprimeable number, because it can be changed into a prime (20983723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91518 + ... + 91746.

It is an arithmetic number, because the mean of its divisors is an integer number (718704).

Almost surely, 2^20983728 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 20983728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28748160).

20983728 is an abundant number, since it is smaller than the sum of its proper divisors (36512592).

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

20983728 is a wasteful number, since it uses less digits than its factorization.

20983728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 20983728 is about 4580.7999301432. The cubic root of 20983728 is about 275.8211401548.

The spelling of 20983728 in words is "twenty million, nine hundred eighty-three thousand, seven hundred twenty-eight".