8168722020 has 168 divisors, whose sum is σ = 27233459064. Its totient is φ = 2050126848.

The previous prime is 8168722019. The next prime is 8168722031. The reversal of 8168722020 is 202278618.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4080909924 + 4087812096 = 63882^2 + 63936^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 231382 + ... + 264338.

It is an arithmetic number, because the mean of its divisors is an integer number (162103923).

Almost surely, 2^8168722020 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 8168722020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13616729532).

8168722020 is an abundant number, since it is smaller than the sum of its proper divisors (19064737044).

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

8168722020 is a wasteful number, since it uses less digits than its factorization.

8168722020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33001 (or 32984 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 8168722020 is about 90380.9826235586. The cubic root of 8168722020 is about 2013.9624662687.

The spelling of 8168722020 in words is "eight billion, one hundred sixty-eight million, seven hundred twenty-two thousand, twenty".