820920222 has 12 divisors (see below), whose sum is σ = 1778660520. Its totient is φ = 273640068.

The previous prime is 820920211. The next prime is 820920227. The reversal of 820920222 is 222029028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820920227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22803322 + ... + 22803357.

It is an arithmetic number, because the mean of its divisors is an integer number (148221710).

Almost surely, 2^820920222 is an apocalyptic number.

820920222 is an abundant number, since it is smaller than the sum of its proper divisors (957740298).

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

820920222 is a wasteful number, since it uses less digits than its factorization.

820920222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45606687 (or 45606684 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 820920222 is about 28651.7053942693. The cubic root of 820920222 is about 936.3401609901.

The spelling of 820920222 in words is "eight hundred twenty million, nine hundred twenty thousand, two hundred twenty-two".