820280 has 16 divisors (see below), whose sum is σ = 1845720. Its totient is φ = 328096.

The previous prime is 820279. The next prime is 820319. The reversal of 820280 is 82028.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10214 + ... + 10293.

2⁸²⁰²⁸⁰ is an apocalyptic number.

It is an amenable number.

820280 is an abundant number, since it is smaller than the sum of its proper divisors (1025440).

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

820280 is a wasteful number, since it uses less digits than its factorization.

820280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20518 (or 20514 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 820280 is about 905.6931047546. The cubic root of 820280 is about 93.6096685656.

820280 divided by its sum of digits (20) gives a palindrome (41014).

The spelling of 820280 in words is "eight hundred twenty thousand, two hundred eighty".