20305525 has 6 divisors (see below), whose sum is σ = 25178882. Its totient is φ = 16244400.

The previous prime is 20305517. The next prime is 20305541. The reversal of 20305525 is 52550302.

It can be written as a sum of positive squares in 3 ways, for example, as 3992004 + 16313521 = 1998^2 + 4039^2 .

It is not a de Polignac number, because 20305525 - 2³ = 20305517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20305496 and 20305505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406086 + ... + 406135.

Almost surely, 2^20305525 is an apocalyptic number.

20305525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20305525 is a deficient number, since it is larger than the sum of its proper divisors (4873357).

20305525 is an equidigital number, since it uses as much as digits as its factorization.

20305525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812231 (or 812226 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 22.

The square root of 20305525 is about 4506.1652211165. The cubic root of 20305525 is about 272.8169865628.

Adding to 20305525 its reverse (52550302), we get a palindrome (72855827).

The spelling of 20305525 in words is "twenty million, three hundred five thousand, five hundred twenty-five".