20328280 has 64 divisors (see below), whose sum is σ = 52992000. Its totient is φ = 6873984.

The previous prime is 20328257. The next prime is 20328307. The reversal of 20328280 is 8282302.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21661 + ... + 22579.

It is an arithmetic number, because the mean of its divisors is an integer number (828000).

Almost surely, 2^20328280 is an apocalyptic number.

20328280 is a gapful number since it is divisible by the number (20) 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 20328280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26496000).

20328280 is an abundant number, since it is smaller than the sum of its proper divisors (32663720).

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

20328280 is a wasteful number, since it uses less digits than its factorization.

20328280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 20328280 is about 4508.6893882813. The cubic root of 20328280 is about 272.9188575729.

The spelling of 20328280 in words is "twenty million, three hundred twenty-eight thousand, two hundred eighty".