20728050 has 96 divisors (see below), whose sum is σ = 61900800. Its totient is φ = 4484160.

The previous prime is 20728033. The next prime is 20728061. The reversal of 20728050 is 5082702.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20728050.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19431 + ... + 20469.

It is an arithmetic number, because the mean of its divisors is an integer number (644800).

Almost surely, 2^20728050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20728050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30950400).

20728050 is an abundant number, since it is smaller than the sum of its proper divisors (41172750).

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

20728050 is a wasteful number, since it uses less digits than its factorization.

20728050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080 (or 1075 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 20728050 is about 4552.8068265631. The cubic root of 20728050 is about 274.6963038552.

The spelling of 20728050 in words is "twenty million, seven hundred twenty-eight thousand, fifty".