818320020 has 96 divisors (see below), whose sum is σ = 2703138816. Its totient is φ = 181008000.

The previous prime is 818320003. The next prime is 818320031. The reversal of 818320020 is 20023818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18406 + ... + 44445.

It is an arithmetic number, because the mean of its divisors is an integer number (28157696).

Almost surely, 2^818320020 is an apocalyptic number.

It is an amenable number.

818320020 is an abundant number, since it is smaller than the sum of its proper divisors (1884818796).

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

818320020 is a wasteful number, since it uses less digits than its factorization.

818320020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62901 (or 62899 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 818320020 is about 28606.2933635240. The cubic root of 818320020 is about 935.3505201073.

Adding to 818320020 its reverse (20023818), we get a palindrome (838343838).

It can be divided in two parts, 8183 and 20020, that added together give a triangular number (28203 = T₂₃₇).

The spelling of 818320020 in words is "eight hundred eighteen million, three hundred twenty thousand, twenty".