820222 has 8 divisors (see below), whose sum is σ = 1325016. Its totient is φ = 378552.

The previous prime is 820213. The next prime is 820223. The reversal of 820222 is 222028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 820196 and 820205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820223) by changing a digit.

820222 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 3 ways as a sum of consecutive naturals, for example, 15748 + ... + 15799.

It is an arithmetic number, because the mean of its divisors is an integer number (165627).

2⁸²⁰²²² is an apocalyptic number.

820222 is a deficient number, since it is larger than the sum of its proper divisors (504794).

820222 is a wasteful number, since it uses less digits than its factorization.

820222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31562.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 820222 is about 905.6610845123. The cubic root of 820222 is about 93.6074622097.

The spelling of 820222 in words is "eight hundred twenty thousand, two hundred twenty-two".