820420597 has 2 divisors, whose sum is σ = 820420598. Its totient is φ = 820420596.

The previous prime is 820420583. The next prime is 820420621. The reversal of 820420597 is 795024028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 792478801 + 27941796 = 28151^2 + 5286^2 .

It is a cyclic number.

It is not a de Polignac number, because 820420597 - 2¹¹ = 820418549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (820420507) by changing a digit.

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 as a sum of consecutive naturals, namely, 410210298 + 410210299.

It is an arithmetic number, because the mean of its divisors is an integer number (410210299).

Almost surely, 2^820420597 is an apocalyptic number.

It is an amenable number.

820420597 is a deficient number, since it is larger than the sum of its proper divisors (1).

820420597 is an equidigital number, since it uses as much as digits as its factorization.

820420597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 820420597 is about 28642.9851272524. The cubic root of 820420597 is about 936.1501653081.

The spelling of 820420597 in words is "eight hundred twenty million, four hundred twenty thousand, five hundred ninety-seven".