220306025 has 6 divisors (see below), whose sum is σ = 273179502. Its totient is φ = 176244800.

The previous prime is 220306003. The next prime is 220306033. The reversal of 220306025 is 520603022.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 10316944 + 209989081 = 3212^2 + 14491^2 .

It is not a de Polignac number, because 220306025 - 2⁶ = 220305961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220305988 and 220306006.

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 5 ways as a sum of consecutive naturals, for example, 4406096 + ... + 4406145.

It is an arithmetic number, because the mean of its divisors is an integer number (45529917).

Almost surely, 2^220306025 is an apocalyptic number.

220306025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

220306025 is a deficient number, since it is larger than the sum of its proper divisors (52873477).

220306025 is an equidigital number, since it uses as much as digits as its factorization.

220306025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8812251 (or 8812246 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 220306025 is about 14842.7094898472. The cubic root of 220306025 is about 603.9608553568.

Adding to 220306025 its reverse (520603022), we get a palindrome (740909047).

The spelling of 220306025 in words is "two hundred twenty million, three hundred six thousand, twenty-five".