820606 has 8 divisors (see below), whose sum is σ = 1242144. Its totient is φ = 406560.

The previous prime is 820597. The next prime is 820609. The reversal of 820606 is 606028.

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

820606 is a modest number, since divided by 606 gives 82 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820609) 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 3 ways as a sum of consecutive naturals, for example, 1590 + ... + 2041.

It is an arithmetic number, because the mean of its divisors is an integer number (155268).

2⁸²⁰⁶⁰⁶ is an apocalyptic number.

820606 is a deficient number, since it is larger than the sum of its proper divisors (421538).

820606 is a wasteful number, since it uses less digits than its factorization.

820606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3746.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 820606 is about 905.8730595398. The cubic root of 820606 is about 93.6220678724.

The spelling of 820606 in words is "eight hundred twenty thousand, six hundred six".