20005225 has 6 divisors (see below), whose sum is σ = 24806510. Its totient is φ = 16004160.

The previous prime is 20005213. The next prime is 20005231. The reversal of 20005225 is 52250002.

It can be written as a sum of positive squares in 3 ways, for example, as 2832489 + 17172736 = 1683^2 + 4144^2 .

It is not a de Polignac number, because 20005225 - 2⁹ = 20004713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20005199 and 20005208.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400080 + ... + 400129.

Almost surely, 2^20005225 is an apocalyptic number.

20005225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20005225 is a deficient number, since it is larger than the sum of its proper divisors (4801285).

20005225 is an equidigital number, since it uses as much as digits as its factorization.

20005225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800219 (or 800214 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20005225 is about 4472.7200896099. The cubic root of 20005225 is about 271.4653976547.

Adding to 20005225 its reverse (52250002), we get a palindrome (72255227).

It can be divided in two parts, 2000 and 5225, that added together give a square (7225 = 85²).

The spelling of 20005225 in words is "twenty million, five thousand, two hundred twenty-five".