20204225 has 6 divisors (see below), whose sum is σ = 25053270. Its totient is φ = 16163360.

The previous prime is 20204221. The next prime is 20204231. The reversal of 20204225 is 52240202.

It can be written as a sum of positive squares in 3 ways, for example, as 97969 + 20106256 = 313^2 + 4484^2 .

It is not a de Polignac number, because 20204225 - 2² = 20204221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20204221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404060 + ... + 404109.

It is an arithmetic number, because the mean of its divisors is an integer number (4175545).

Almost surely, 2^20204225 is an apocalyptic number.

20204225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20204225 is a deficient number, since it is larger than the sum of its proper divisors (4849045).

20204225 is an equidigital number, since it uses as much as digits as its factorization.

20204225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808179 (or 808174 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 20204225 is about 4494.9110113550. The cubic root of 20204225 is about 272.3625544830.

Adding to 20204225 its reverse (52240202), we get a palindrome (72444427).

The spelling of 20204225 in words is "twenty million, two hundred four thousand, two hundred twenty-five".