20305225 has 12 divisors (see below), whose sum is σ = 26660124. Its totient is φ = 15288320.

The previous prime is 20305213. The next prime is 20305231. The reversal of 20305225 is 52250302.

It can be written as a sum of positive squares in 6 ways, for example, as 207936 + 20097289 = 456^2 + 4483^2 .

It is not a de Polignac number, because 20305225 - 2⁷ = 20305097 is a prime.

It is a Duffinian number.

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, 23464 + ... + 24313.

It is an arithmetic number, because the mean of its divisors is an integer number (2221677).

Almost surely, 2^20305225 is an apocalyptic number.

20305225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20305225 is a deficient number, since it is larger than the sum of its proper divisors (6354899).

20305225 is a wasteful number, since it uses less digits than its factorization.

20305225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47804 (or 47799 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 19.

The square root of 20305225 is about 4506.1319332660. The cubic root of 20305225 is about 272.8156429958.

Adding to 20305225 its reverse (52250302), we get a palindrome (72555527).

The spelling of 20305225 in words is "twenty million, three hundred five thousand, two hundred twenty-five".