20312224 has 12 divisors (see below), whose sum is σ = 39989754. Its totient is φ = 10156096.

The previous prime is 20312221. The next prime is 20312233. The reversal of 20312224 is 42221302.

It can be written as a sum of positive squares in only one way, i.e., 16548624 + 3763600 = 4068^2 + 1940^2 .

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 = 20312198 and 20312207.

It is not an unprimeable number, because it can be changed into a prime (20312221) 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 as a sum of consecutive naturals, namely, 317347 + ... + 317410.

Almost surely, 2^20312224 is an apocalyptic number.

It is an amenable number.

20312224 is a deficient number, since it is larger than the sum of its proper divisors (19677530).

20312224 is an equidigital number, since it uses as much as digits as its factorization.

20312224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634767 (or 634759 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20312224 is about 4506.9084747751. The cubic root of 20312224 is about 272.8469849671.

Adding to 20312224 its reverse (42221302), we get a palindrome (62533526).

The spelling of 20312224 in words is "twenty million, three hundred twelve thousand, two hundred twenty-four".