868208020 has 36 divisors (see below), whose sum is σ = 1936807740. Its totient is φ = 326852608.

The previous prime is 868208009. The next prime is 868208023. The reversal of 868208020 is 20802868.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 31494544 + 836713476 = 5612^2 + 28926^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868208023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69325 + ... + 80884.

It is an arithmetic number, because the mean of its divisors is an integer number (53800215).

Almost surely, 2^868208020 is an apocalyptic number.

It is an amenable number.

868208020 is an abundant number, since it is smaller than the sum of its proper divisors (1068599720).

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

868208020 is a wasteful number, since it uses less digits than its factorization.

868208020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150252 (or 150233 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 868208020 is about 29465.3698432584. The cubic root of 868208020 is about 953.9843812224.

The spelling of 868208020 in words is "eight hundred sixty-eight million, two hundred eight thousand, twenty".