820688888020 has 48 divisors (see below), whose sum is σ = 1731037891968. Its totient is φ = 326832485760.

The previous prime is 820688888011. The next prime is 820688888021. The reversal of 820688888020 is 20888886028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820688888021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4497889 + ... + 4676791.

It is an arithmetic number, because the mean of its divisors is an integer number (36063289416).

Almost surely, 2^820688888020 is an apocalyptic number.

It is an amenable number.

820688888020 is an abundant number, since it is smaller than the sum of its proper divisors (910349003948).

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

820688888020 is a wasteful number, since it uses less digits than its factorization.

820688888020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179920 (or 179918 counting only the distinct ones).

The product of its (nonzero) digits is 6291456, while the sum is 58.

The spelling of 820688888020 in words is "eight hundred twenty billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, twenty".