820630 has 16 divisors (see below), whose sum is σ = 1490400. Its totient is φ = 325312.

The previous prime is 820627. The next prime is 820637. The reversal of 820630 is 36028.

It is a junction number, because it is equal to n+sod(n) for n = 820598 and 820607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1071 + ... + 1669.

It is an arithmetic number, because the mean of its divisors is an integer number (93150).

2⁸²⁰⁶³⁰ is an apocalyptic number.

820630 is a deficient number, since it is larger than the sum of its proper divisors (669770).

820630 is a wasteful number, since it uses less digits than its factorization.

820630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 820630 is about 905.8863063321. The cubic root of 820630 is about 93.6229805750.

Adding to 820630 its reverse (36028), we get a palindrome (856658).

The spelling of 820630 in words is "eight hundred twenty thousand, six hundred thirty".