20187225 has 36 divisors (see below), whose sum is σ = 37508016. Its totient is φ = 10763280.

The previous prime is 20187203. The next prime is 20187227. The reversal of 20187225 is 52278102.

It is not a de Polignac number, because 20187225 - 2¹¹ = 20185177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20187227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4414 + ... + 7736.

Almost surely, 2^20187225 is an apocalyptic number.

20187225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20187225 is a deficient number, since it is larger than the sum of its proper divisors (17320791).

20187225 is an equidigital number, since it uses as much as digits as its factorization.

20187225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3348 (or 3331 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20187225 is about 4493.0195859800. The cubic root of 20187225 is about 272.2861436885.

The spelling of 20187225 in words is "twenty million, one hundred eighty-seven thousand, two hundred twenty-five".