20388328 has 32 divisors (see below), whose sum is σ = 39744000. Its totient is φ = 9794880.

The previous prime is 20388323. The next prime is 20388353. The reversal of 20388328 is 82388302.

It is a junction number, because it is equal to n+sod(n) for n = 20388293 and 20388302.

It is not an unprimeable number, because it can be changed into a prime (20388323) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 56613 + ... + 56971.

It is an arithmetic number, because the mean of its divisors is an integer number (1242000).

Almost surely, 2^20388328 is an apocalyptic number.

It is an amenable number.

20388328 is a deficient number, since it is larger than the sum of its proper divisors (19355672).

20388328 is a wasteful number, since it uses less digits than its factorization.

20388328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 20388328 is about 4515.3436192609. The cubic root of 20388328 is about 273.1873197270.

The spelling of 20388328 in words is "twenty million, three hundred eighty-eight thousand, three hundred twenty-eight".