820818012 has 72 divisors (see below), whose sum is σ = 2345226240. Its totient is φ = 222173280.

The previous prime is 820817989. The next prime is 820818023. The reversal of 820818012 is 210818028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25564 + ... + 47907.

Almost surely, 2^820818012 is an apocalyptic number.

It is an amenable number.

820818012 is an abundant number, since it is smaller than the sum of its proper divisors (1524408228).

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

820818012 is a wasteful number, since it uses less digits than its factorization.

820818012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73511 (or 73502 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 820818012 is about 28649.9216752856. The cubic root of 820818012 is about 936.3012991952.

The spelling of 820818012 in words is "eight hundred twenty million, eight hundred eighteen thousand, twelve".