820020668668 has 12 divisors (see below), whose sum is σ = 1435055326992. Its totient is φ = 410004860960.

The previous prime is 820020668629. The next prime is 820020668689. The reversal of 820020668668 is 866866020028.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021480 + ... + 1638127.

It is an arithmetic number, because the mean of its divisors is an integer number (119587943916).

Almost surely, 2^820020668668 is an apocalyptic number.

It is an amenable number.

820020668668 is a deficient number, since it is larger than the sum of its proper divisors (615034658324).

820020668668 is a wasteful number, since it uses less digits than its factorization.

820020668668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736692 (or 2736690 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 52.

The spelling of 820020668668 in words is "eight hundred twenty billion, twenty million, six hundred sixty-eight thousand, six hundred sixty-eight".