20351225 has 6 divisors (see below), whose sum is σ = 25235550. Its totient is φ = 16280960.

The previous prime is 20351207. The next prime is 20351239. The reversal of 20351225 is 52215302.

It can be written as a sum of positive squares in 3 ways, for example, as 110224 + 20241001 = 332^2 + 4499^2 .

It is not a de Polignac number, because 20351225 - 2⁸ = 20350969 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20351197 and 20351206.

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, 407000 + ... + 407049.

It is an arithmetic number, because the mean of its divisors is an integer number (4205925).

Almost surely, 2^20351225 is an apocalyptic number.

20351225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20351225 is a deficient number, since it is larger than the sum of its proper divisors (4884325).

20351225 is an equidigital number, since it uses as much as digits as its factorization.

20351225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814059 (or 814054 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20351225 is about 4511.2332016867. The cubic root of 20351225 is about 273.0215022400.

Adding to 20351225 its reverse (52215302), we get a palindrome (72566527).

The spelling of 20351225 in words is "twenty million, three hundred fifty-one thousand, two hundred twenty-five".