8021560820 has 96 divisors (see below), whose sum is σ = 20760972288. Its totient is φ = 2535224832.

The previous prime is 8021560819. The next prime is 8021560949. The reversal of 8021560820 is 280651208.

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, 1549877 + ... + 1555043.

It is an arithmetic number, because the mean of its divisors is an integer number (216260128).

Almost surely, 2^8021560820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8021560820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10380486144).

8021560820 is an abundant number, since it is smaller than the sum of its proper divisors (12739411468).

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

8021560820 is a wasteful number, since it uses less digits than its factorization.

8021560820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6049 (or 6047 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 8021560820 is about 89563.1666479028. The cubic root of 8021560820 is about 2001.7951232841.

The spelling of 8021560820 in words is "eight billion, twenty-one million, five hundred sixty thousand, eight hundred twenty".