820330565 has 16 divisors (see below), whose sum is σ = 1021107648. Its totient is φ = 632209536.

The previous prime is 820330561. The next prime is 820330579. The reversal of 820330565 is 565033028.

It is a cyclic number.

It is not a de Polignac number, because 820330565 - 2² = 820330561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820330561) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10439 + ... + 41828.

It is an arithmetic number, because the mean of its divisors is an integer number (63819228).

Almost surely, 2^820330565 is an apocalyptic number.

It is an amenable number.

820330565 is a deficient number, since it is larger than the sum of its proper divisors (200777083).

820330565 is a wasteful number, since it uses less digits than its factorization.

820330565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52388.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 820330565 is about 28641.4134602327. The cubic root of 820330565 is about 936.1159200461.

The spelling of 820330565 in words is "eight hundred twenty million, three hundred thirty thousand, five hundred sixty-five".