20328625 has 8 divisors (see below), whose sum is σ = 25370280. Its totient is φ = 16262800.

The previous prime is 20328589. The next prime is 20328629. The reversal of 20328625 is 52682302.

It can be written as a sum of positive squares in 4 ways, for example, as 6561 + 20322064 = 81^2 + 4508^2 .

It is not a de Polignac number, because 20328625 - 2²³ = 11940017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20328593 and 20328602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20328629) 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, 81190 + ... + 81439.

It is an arithmetic number, because the mean of its divisors is an integer number (3171285).

Almost surely, 2^20328625 is an apocalyptic number.

20328625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20328625 is a deficient number, since it is larger than the sum of its proper divisors (5041655).

20328625 is an equidigital number, since it uses as much as digits as its factorization.

20328625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162644 (or 162634 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20328625 is about 4508.7276475742. The cubic root of 20328625 is about 272.9204015054.

The spelling of 20328625 in words is "twenty million, three hundred twenty-eight thousand, six hundred twenty-five".