820546 has 8 divisors (see below), whose sum is σ = 1254204. Its totient is φ = 402480.

The previous prime is 820541. The next prime is 820559. The reversal of 820546 is 645028.

It can be written as a sum of positive squares in 2 ways, for example, as 819025 + 1521 = 905^2 + 39^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 820546.

It is not an unprimeable number, because it can be changed into a prime (820541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3765 + ... + 3976.

2⁸²⁰⁵⁴⁶ is an apocalyptic number.

820546 is a deficient number, since it is larger than the sum of its proper divisors (433658).

820546 is a wasteful number, since it uses less digits than its factorization.

820546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7796.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 820546 is about 905.8399417116. The cubic root of 820546 is about 93.6197860380.

The spelling of 820546 in words is "eight hundred twenty thousand, five hundred forty-six".