20505250 has 16 divisors (see below), whose sum is σ = 38386296. Its totient is φ = 8202000.

The previous prime is 20505241. The next prime is 20505253. The reversal of 20505250 is 5250502.

It can be written as a sum of positive squares in 4 ways, for example, as 12837889 + 7667361 = 3583^2 + 2769^2 .

It is not an unprimeable number, because it can be changed into a prime (20505253) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 40761 + ... + 41260.

Almost surely, 2^20505250 is an apocalyptic number.

20505250 is a deficient number, since it is larger than the sum of its proper divisors (17881046).

20505250 is an equidigital number, since it uses as much as digits as its factorization.

20505250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82038 (or 82028 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 20505250 is about 4528.2722974662. The cubic root of 20505250 is about 273.7085451151.

Adding to 20505250 its reverse (5250502), we get a palindrome (25755752).

The spelling of 20505250 in words is "twenty million, five hundred five thousand, two hundred fifty".