20003328 has 80 divisors (see below), whose sum is σ = 59252160. Its totient is φ = 6663168.

The previous prime is 20003317. The next prime is 20003369. The reversal of 20003328 is 82330002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20003328.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13101 + ... + 14547.

It is an arithmetic number, because the mean of its divisors is an integer number (740652).

Almost surely, 2^20003328 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 20003328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29626080).

20003328 is an abundant number, since it is smaller than the sum of its proper divisors (39248832).

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

20003328 is an equidigital number, since it uses as much as digits as its factorization.

20003328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474 (or 1452 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20003328 is about 4472.5080212337. The cubic root of 20003328 is about 271.4568167942.

The spelling of 20003328 in words is "twenty million, three thousand, three hundred twenty-eight".