820445420 has 24 divisors (see below), whose sum is σ = 1797846624. Its totient is φ = 313909376.

The previous prime is 820445413. The next prime is 820445477. The reversal of 820445420 is 24544028.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891329 + ... + 892248.

It is an arithmetic number, because the mean of its divisors is an integer number (74910276).

Almost surely, 2^820445420 is an apocalyptic number.

It is an amenable number.

820445420 is an abundant number, since it is smaller than the sum of its proper divisors (977401204).

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

820445420 is a wasteful number, since it uses less digits than its factorization.

820445420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783609 (or 1783607 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 29.

The square root of 820445420 is about 28643.4184412406. The cubic root of 820445420 is about 936.1596067341.

Adding to 820445420 its reverse (24544028), we get a palindrome (844989448).

The spelling of 820445420 in words is "eight hundred twenty million, four hundred forty-five thousand, four hundred twenty".