20224320 has 56 divisors (see below), whose sum is σ = 64215264. Its totient is φ = 5392896.

The previous prime is 20224301. The next prime is 20224327. The reversal of 20224320 is 2342202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20224320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20224327) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9574 + ... + 11493.

Almost surely, 2^20224320 is an apocalyptic number.

20224320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20224320 is an abundant number, since it is smaller than the sum of its proper divisors (43990944).

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

20224320 is a wasteful number, since it uses less digits than its factorization.

20224320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21087 (or 21077 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 20224320 is about 4497.1457614803. The cubic root of 20224320 is about 272.4528212799.

Adding to 20224320 its reverse (2342202), we get a palindrome (22566522).

The spelling of 20224320 in words is "twenty million, two hundred twenty-four thousand, three hundred twenty".