820550 has 12 divisors (see below), whose sum is σ = 1526316. Its totient is φ = 328200.

The previous prime is 820541. The next prime is 820559. The reversal of 820550 is 55028.

It is an interprime number because it is at equal distance from previous prime (820541) and next prime (820559).

It is a hoax number, since the sum of its digits (20) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820559) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8156 + ... + 8255.

It is an arithmetic number, because the mean of its divisors is an integer number (127193).

2⁸²⁰⁵⁵⁰ is an apocalyptic number.

820550 is a deficient number, since it is larger than the sum of its proper divisors (705766).

820550 is a wasteful number, since it uses less digits than its factorization.

820550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16423 (or 16418 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 820550 is about 905.8421496044. The cubic root of 820550 is about 93.6199381638.

Adding to 820550 its reverse (55028), we get a palindrome (875578).

The spelling of 820550 in words is "eight hundred twenty thousand, five hundred fifty".