20320225 has 12 divisors (see below), whose sum is σ = 25423596. Its totient is φ = 16110080.

The previous prime is 20320211. The next prime is 20320241. The reversal of 20320225 is 52202302.

It can be written as a sum of positive squares in 6 ways, for example, as 9144576 + 11175649 = 3024^2 + 3343^2 .

It is not a de Polignac number, because 20320225 - 2⁹ = 20319713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20320199 and 20320208.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 772 + ... + 6421.

It is an arithmetic number, because the mean of its divisors is an integer number (2118633).

Almost surely, 2^20320225 is an apocalyptic number.

20320225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20320225 is a deficient number, since it is larger than the sum of its proper divisors (5103371).

20320225 is a wasteful number, since it uses less digits than its factorization.

20320225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7316 (or 7311 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20320225 is about 4507.7960246666. The cubic root of 20320225 is about 272.8828051405.

Adding to 20320225 its reverse (52202302), we get a palindrome (72522527).

The spelling of 20320225 in words is "twenty million, three hundred twenty thousand, two hundred twenty-five".