20536225 has 6 divisors (see below), whose sum is σ = 25464950. Its totient is φ = 16428960.

The previous prime is 20536213. The next prime is 20536231. The reversal of 20536225 is 52263502.

It can be written as a sum of positive squares in 3 ways, for example, as 5161984 + 15374241 = 2272^2 + 3921^2 .

It is not a de Polignac number, because 20536225 - 2⁵ = 20536193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 821449 = 20536225 / (2 + 0 + 5 + 3 + 6 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 20536225.

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, 410700 + ... + 410749.

Almost surely, 2^20536225 is an apocalyptic number.

20536225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20536225 is a deficient number, since it is larger than the sum of its proper divisors (4928725).

20536225 is an equidigital number, since it uses as much as digits as its factorization.

20536225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821459 (or 821454 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 20536225 is about 4531.6911854185. The cubic root of 20536225 is about 273.8462961265.

Adding to 20536225 its reverse (52263502), we get a palindrome (72799727).

The spelling of 20536225 in words is "twenty million, five hundred thirty-six thousand, two hundred twenty-five".