20305025 has 12 divisors (see below), whose sum is σ = 27115452. Its totient is φ = 14994240.

The previous prime is 20305013. The next prime is 20305039. The reversal of 20305025 is 52050302.

20305025 = T₁₂₆₂ + T₁₂₆₃ + ... + T₁₂₈₆.

It can be written as a sum of positive squares in 6 ways, for example, as 4844401 + 15460624 = 2201^2 + 3932^2 .

It is not a de Polignac number, because 20305025 - 2⁶ = 20304961 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20304994 and 20305012.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 30914 + ... + 31563.

It is an arithmetic number, because the mean of its divisors is an integer number (2259621).

Almost surely, 2^20305025 is an apocalyptic number.

20305025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20305025 is a deficient number, since it is larger than the sum of its proper divisors (6810427).

20305025 is a wasteful number, since it uses less digits than its factorization.

20305025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62500 (or 62495 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 17.

The square root of 20305025 is about 4506.1097412291. The cubic root of 20305025 is about 272.8147472771.

Adding to 20305025 its reverse (52050302), we get a palindrome (72355327).

The spelling of 20305025 in words is "twenty million, three hundred five thousand, twenty-five".