20390328 has 96 divisors (see below), whose sum is σ = 65894400. Its totient is φ = 5569344.

The previous prime is 20390323. The next prime is 20390329. The reversal of 20390328 is 82309302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20390323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10713 + ... + 12471.

It is an arithmetic number, because the mean of its divisors is an integer number (686400).

Almost surely, 2^20390328 is an apocalyptic number.

20390328 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 20390328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32947200).

20390328 is an abundant number, since it is smaller than the sum of its proper divisors (45504072).

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

20390328 is a wasteful number, since it uses less digits than its factorization.

20390328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801 (or 1794 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20390328 is about 4515.5650809173. The cubic root of 20390328 is about 273.1962522361.

The spelling of 20390328 in words is "twenty million, three hundred ninety thousand, three hundred twenty-eight".