20224224 has 36 divisors (see below), whose sum is σ = 57513456. Its totient is φ = 6741312.

The previous prime is 20224207. The next prime is 20224229. The reversal of 20224224 is 42242202.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20224197 and 20224206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20224229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34824 + ... + 35399.

It is an arithmetic number, because the mean of its divisors is an integer number (1597596).

Almost surely, 2^20224224 is an apocalyptic number.

20224224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20224224 is an abundant number, since it is smaller than the sum of its proper divisors (37289232).

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

20224224 is a wasteful number, since it uses less digits than its factorization.

20224224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70239 (or 70228 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20224224 is about 4497.1350880310. The cubic root of 20224224 is about 272.4523901898.

Adding to 20224224 its reverse (42242202), we get a palindrome (62466426).

The spelling of 20224224 in words is "twenty million, two hundred twenty-four thousand, two hundred twenty-four".