820570 has 16 divisors (see below), whose sum is σ = 1525248. Its totient is φ = 317520.

The previous prime is 820559. The next prime is 820577. The reversal of 820570 is 75028.

It is a nialpdrome in base 7.

It is a zygodrome in base 7.

It is not an unprimeable number, because it can be changed into a prime (820577) 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, 1014 + ... + 1633.

It is an arithmetic number, because the mean of its divisors is an integer number (95328).

2⁸²⁰⁵⁷⁰ is an apocalyptic number.

820570 is a deficient number, since it is larger than the sum of its proper divisors (704678).

820570 is a wasteful number, since it uses less digits than its factorization.

820570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 820570 is about 905.8531889881. The cubic root of 820570 is about 93.6206987851.

Adding to 820570 its reverse (75028), we get a palindrome (895598).

The spelling of 820570 in words is "eight hundred twenty thousand, five hundred seventy".