20428224 has 28 divisors (see below), whose sum is σ = 54050184. Its totient is φ = 6809344.

The previous prime is 20428223. The next prime is 20428231. The reversal of 20428224 is 42282402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 20428194 and 20428203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20428223) 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 3 ways as a sum of consecutive naturals, for example, 53007 + ... + 53390.

Almost surely, 2^20428224 is an apocalyptic number.

20428224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20428224 is an abundant number, since it is smaller than the sum of its proper divisors (33621960).

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

20428224 is a wasteful number, since it uses less digits than its factorization.

20428224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106412 (or 106402 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 20428224 is about 4519.7592856257. The cubic root of 20428224 is about 273.3653951418.

The spelling of 20428224 in words is "twenty million, four hundred twenty-eight thousand, two hundred twenty-four".