20307025 has 6 divisors (see below), whose sum is σ = 25180742. Its totient is φ = 16245600.

The previous prime is 20306987. The next prime is 20307037. The reversal of 20307025 is 52070302.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3101121 + 17205904 = 1761^2 + 4148^2 .

It is not a de Polignac number, because 20307025 - 2⁹ = 20306513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20306993 and 20307011.

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 5 ways as a sum of consecutive naturals, for example, 406116 + ... + 406165.

Almost surely, 2^20307025 is an apocalyptic number.

20307025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20307025 is a deficient number, since it is larger than the sum of its proper divisors (4873717).

20307025 is an equidigital number, since it uses as much as digits as its factorization.

20307025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812291 (or 812286 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 19.

The square root of 20307025 is about 4506.3316566804. The cubic root of 20307025 is about 272.8237041992.

Adding to 20307025 its reverse (52070302), we get a palindrome (72377327).

The spelling of 20307025 in words is "twenty million, three hundred seven thousand, twenty-five".