820650 has 24 divisors (see below), whose sum is σ = 2035584. Its totient is φ = 218800.

The previous prime is 820649. The next prime is 820657. The reversal of 820650 is 56028.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (820657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2586 + ... + 2885.

It is an arithmetic number, because the mean of its divisors is an integer number (84816).

2⁸²⁰⁶⁵⁰ is an apocalyptic number.

820650 is an abundant number, since it is smaller than the sum of its proper divisors (1214934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820650 is a wasteful number, since it uses less digits than its factorization.

820650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5486 (or 5481 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 820650 is about 905.8973451777. The cubic root of 820650 is about 93.6237411469.

Adding to 820650 its reverse (56028), we get a palindrome (876678).

It can be divided in two parts, 8206 and 50, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 820650 in words is "eight hundred twenty thousand, six hundred fifty".