20128250 has 16 divisors (see below), whose sum is σ = 37680552. Its totient is φ = 8051200.

The previous prime is 20128223. The next prime is 20128279. The reversal of 20128250 is 5282102.

It can be written as a sum of positive squares in 4 ways, for example, as 935089 + 19193161 = 967^2 + 4381^2 .

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 40007 + ... + 40506.

Almost surely, 2^20128250 is an apocalyptic number.

20128250 is a deficient number, since it is larger than the sum of its proper divisors (17552302).

20128250 is an equidigital number, since it uses as much as digits as its factorization.

20128250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80530 (or 80520 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20128250 is about 4486.4518274467. The cubic root of 20128250 is about 272.0207326325.

The spelling of 20128250 in words is "twenty million, one hundred twenty-eight thousand, two hundred fifty".