20728032 has 96 divisors (see below), whose sum is σ = 62106912.
Its totient is φ = 5996544.
The previous prime is 20728009. The next prime is 20728033. The reversal of 20728032 is 23082702.
It is a tau number, because it is divible by the number of its divisors (96).
It is a Harshad number since it is a multiple of its sum of digits (24).
It is a junction number, because it is equal to n+sod(n) for n = 20727993 and 20728011.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20728033) 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, 20728 + ... + 21704.
It is an arithmetic number, because the mean of its divisors is an integer number (646947).
Almost surely, 220728032 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 20728032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31053456).
20728032 is an abundant number, since it is smaller than the sum of its proper divisors (41378880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20728032 is a wasteful number, since it uses less digits than its factorization.
20728032 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1020 (or 1012 counting only the distinct ones).
The product of its (nonzero) digits is 1344, while the sum is 24.
The square root of 20728032 is about 4552.8048497602.
The cubic root of 20728032 is about 274.6962243408.
The spelling of 20728032 in words is "twenty million, seven hundred twenty-eight thousand, thirty-two".