20810245 has 4 divisors (see below), whose sum is σ = 24972300. Its totient is φ = 16648192.

The previous prime is 20810233. The next prime is 20810281. The reversal of 20810245 is 54201802.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9345249 + 11464996 = 3057^2 + 3386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20810245 - 2⁷ = 20810117 is a prime.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2081020 + ... + 2081029.

It is an arithmetic number, because the mean of its divisors is an integer number (6243075).

Almost surely, 2^20810245 is an apocalyptic number.

It is an amenable number.

20810245 is a deficient number, since it is larger than the sum of its proper divisors (4162055).

20810245 is an equidigital number, since it uses as much as digits as its factorization.

20810245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4162054.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20810245 is about 4561.8247445512. The cubic root of 20810245 is about 275.0589185053.

The spelling of 20810245 in words is "twenty million, eight hundred ten thousand, two hundred forty-five".