820530566 has 32 divisors (see below), whose sum is σ = 1303948800. Its totient is φ = 386470656.

The previous prime is 820530563. The next prime is 820530569. The reversal of 820530566 is 665035028.

It is an interprime number because it is at equal distance from previous prime (820530563) and next prime (820530569).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820530563) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1369535 + ... + 1370133.

It is an arithmetic number, because the mean of its divisors is an integer number (40748400).

Almost surely, 2^820530566 is an apocalyptic number.

820530566 is a deficient number, since it is larger than the sum of its proper divisors (483418234).

820530566 is a wasteful number, since it uses less digits than its factorization.

820530566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 820530566 is about 28644.9047127059. The cubic root of 820530566 is about 936.1919905615.

The spelling of 820530566 in words is "eight hundred twenty million, five hundred thirty thousand, five hundred sixty-six".