20108525 has 6 divisors (see below), whose sum is σ = 24934602. Its totient is φ = 16086800.

The previous prime is 20108521. The next prime is 20108531. The reversal of 20108525 is 52580102.

It can be written as a sum of positive squares in 3 ways, for example, as 11236 + 20097289 = 106^2 + 4483^2 .

It is not a de Polignac number, because 20108525 - 2² = 20108521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20108525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20108521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402146 + ... + 402195.

It is an arithmetic number, because the mean of its divisors is an integer number (4155767).

Almost surely, 2^20108525 is an apocalyptic number.

20108525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20108525 is a deficient number, since it is larger than the sum of its proper divisors (4826077).

20108525 is an equidigital number, since it uses as much as digits as its factorization.

20108525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804351 (or 804346 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 20108525 is about 4484.2530035670. The cubic root of 20108525 is about 271.9318465708.

Adding to 20108525 its reverse (52580102), we get a palindrome (72688627).

The spelling of 20108525 in words is "twenty million, one hundred eight thousand, five hundred twenty-five".