20475225 has 72 divisors (see below), whose sum is σ = 39955032. Its totient is φ = 9984000.

The previous prime is 20475197. The next prime is 20475253. The reversal of 20475225 is 52257402.

It is an interprime number because it is at equal distance from previous prime (20475197) and next prime (20475253).

It can be written as a sum of positive squares in 12 ways, for example, as 8649 + 20466576 = 93^2 + 4524^2 .

It is not a de Polignac number, because 20475225 - 2⁸ = 20474969 is a prime.

It is a congruent 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 71 ways as a sum of consecutive naturals, for example, 202675 + ... + 202775.

It is an arithmetic number, because the mean of its divisors is an integer number (554931).

Almost surely, 2^20475225 is an apocalyptic number.

20475225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20475225 is a deficient number, since it is larger than the sum of its proper divisors (19479807).

20475225 is a wasteful number, since it uses less digits than its factorization.

20475225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 20475225 is about 4524.9558008891. The cubic root of 20475225 is about 273.5748864427.

The spelling of 20475225 in words is "twenty million, four hundred seventy-five thousand, two hundred twenty-five".