20307725 has 6 divisors (see below), whose sum is σ = 25181610. Its totient is φ = 16246160.

The previous prime is 20307719. The next prime is 20307731. The reversal of 20307725 is 52770302.

It is an interprime number because it is at equal distance from previous prime (20307719) and next prime (20307731).

It can be written as a sum of positive squares in 3 ways, for example, as 264196 + 20043529 = 514^2 + 4477^2 .

It is not a de Polignac number, because 20307725 - 2¹⁰ = 20306701 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20307694 and 20307703.

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, 406130 + ... + 406179.

It is an arithmetic number, because the mean of its divisors is an integer number (4196935).

Almost surely, 2^20307725 is an apocalyptic number.

20307725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20307725 is a deficient number, since it is larger than the sum of its proper divisors (4873885).

20307725 is an equidigital number, since it uses as much as digits as its factorization.

20307725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812319 (or 812314 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 26.

The square root of 20307725 is about 4506.4093245066. The cubic root of 20307725 is about 272.8268389830.

The spelling of 20307725 in words is "twenty million, three hundred seven thousand, seven hundred twenty-five".