820248305 has 4 divisors (see below), whose sum is σ = 984297972. Its totient is φ = 656198640.

The previous prime is 820248281. The next prime is 820248311. The reversal of 820248305 is 503842028.

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 169182049 + 651066256 = 13007^2 + 25516^2 .

It is not a de Polignac number, because 820248305 - 2¹² = 820244209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82024826 + ... + 82024835.

It is an arithmetic number, because the mean of its divisors is an integer number (246074493).

Almost surely, 2^820248305 is an apocalyptic number.

It is an amenable number.

820248305 is a deficient number, since it is larger than the sum of its proper divisors (164049667).

820248305 is a wasteful number, since it uses less digits than its factorization.

820248305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164049666.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 820248305 is about 28639.9773917509. The cubic root of 820248305 is about 936.0846288110.

The spelling of 820248305 in words is "eight hundred twenty million, two hundred forty-eight thousand, three hundred five".