20428324 has 24 divisors (see below), whose sum is σ = 42634368. Its totient is φ = 8374080.

The previous prime is 20428319. The next prime is 20428379. The reversal of 20428324 is 42382402.

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 7 ways as a sum of consecutive naturals, for example, 15217 + ... + 16504.

It is an arithmetic number, because the mean of its divisors is an integer number (1776432).

Almost surely, 2^20428324 is an apocalyptic number.

It is an amenable number.

20428324 is an abundant number, since it is smaller than the sum of its proper divisors (22206044).

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

20428324 is a wasteful number, since it uses less digits than its factorization.

20428324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31755 (or 31753 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 20428324 is about 4519.7703481482. The cubic root of 20428324 is about 273.3658411994.

The spelling of 20428324 in words is "twenty million, four hundred twenty-eight thousand, three hundred twenty-four".