20525225 has 24 divisors (see below), whose sum is σ = 30623040. Its totient is φ = 13331520.

The previous prime is 20525213. The next prime is 20525231. The reversal of 20525225 is 52252502.

It is a happy number.

It is not a de Polignac number, because 20525225 - 2¹⁶ = 20459689 is a prime.

It is a super-2 number, since 2×20525225² = 842569722601250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20525225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (1275960).

Almost surely, 2^20525225 is an apocalyptic number.

20525225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20525225 is a deficient number, since it is larger than the sum of its proper divisors (10097815).

20525225 is a wasteful number, since it uses less digits than its factorization.

20525225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6209 (or 6204 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 23.

The square root of 20525225 is about 4530.4773479182. The cubic root of 20525225 is about 273.7973931554.

Adding to 20525225 its reverse (52252502), we get a palindrome (72777727).

The spelling of 20525225 in words is "twenty million, five hundred twenty-five thousand, two hundred twenty-five".