820774220 has 24 divisors (see below), whose sum is σ = 1969858464. Its totient is φ = 281408256.

The previous prime is 820774183. The next prime is 820774223. The reversal of 820774220 is 22477028.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (820774223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2931197 + ... + 2931476.

It is an arithmetic number, because the mean of its divisors is an integer number (82077436).

Almost surely, 2^820774220 is an apocalyptic number.

It is an amenable number.

820774220 is an abundant number, since it is smaller than the sum of its proper divisors (1149084244).

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

820774220 is a wasteful number, since it uses less digits than its factorization.

820774220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862689 (or 5862687 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 820774220 is about 28649.1574047126. The cubic root of 820774220 is about 936.2846478242.

The spelling of 820774220 in words is "eight hundred twenty million, seven hundred seventy-four thousand, two hundred twenty".