820040820 has 24 divisors (see below), whose sum is σ = 2296114464. Its totient is φ = 218677536.

The previous prime is 820040803. The next prime is 820040833. The reversal of 820040820 is 28040028.

It is a congruent number.

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, 6833614 + ... + 6833733.

It is an arithmetic number, because the mean of its divisors is an integer number (95671436).

Almost surely, 2^820040820 is an apocalyptic number.

It is an amenable number.

820040820 is an abundant number, since it is smaller than the sum of its proper divisors (1476073644).

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

820040820 is a wasteful number, since it uses less digits than its factorization.

820040820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13667359 (or 13667357 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 820040820 is about 28636.3548657995. The cubic root of 820040820 is about 936.0056934054.

Adding to 820040820 its reverse (28040028), we get a palindrome (848080848).

The spelling of 820040820 in words is "eight hundred twenty million, forty thousand, eight hundred twenty".