820422 has 16 divisors (see below), whose sum is σ = 1823280. Its totient is φ = 273456.

The previous prime is 820411. The next prime is 820427. The reversal of 820422 is 224028.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 820395 and 820404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820427) by changing a digit.

820422 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7543 + ... + 7650.

It is an arithmetic number, because the mean of its divisors is an integer number (113955).

2⁸²⁰⁴²² is an apocalyptic number.

820422 is an abundant number, since it is smaller than the sum of its proper divisors (1002858).

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

820422 is a wasteful number, since it uses less digits than its factorization.

820422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15204 (or 15198 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 820422 is about 905.7714943627. The cubic root of 820422 is about 93.6150698944.

The spelling of 820422 in words is "eight hundred twenty thousand, four hundred twenty-two".