20420224 has 32 divisors (see below), whose sum is σ = 44382240. Its totient is φ = 9281280.

The previous prime is 20420221. The next prime is 20420237. The reversal of 20420224 is 42202402.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 20420198 and 20420207.

It is not an unprimeable number, because it can be changed into a prime (20420221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5844 + ... + 8659.

It is an arithmetic number, because the mean of its divisors is an integer number (1386945).

Almost surely, 2^20420224 is an apocalyptic number.

It is an amenable number.

20420224 is an abundant number, since it is smaller than the sum of its proper divisors (23962016).

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

20420224 is a wasteful number, since it uses less digits than its factorization.

20420224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14528 (or 14516 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20420224 is about 4518.8741960803. The cubic root of 20420224 is about 273.3297058148.

Adding to 20420224 its reverse (42202402), we get a palindrome (62622626).

The spelling of 20420224 in words is "twenty million, four hundred twenty thousand, two hundred twenty-four".