668802020 has 12 divisors (see below), whose sum is σ = 1404484284. Its totient is φ = 267520800.

The previous prime is 668802011. The next prime is 668802061. The reversal of 668802020 is 20208866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 174451264 + 494350756 = 13208^2 + 22234^2 .

It is a super-2 number, since 2×668802020² = 894592283912160800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16720031 + ... + 16720070.

It is an arithmetic number, because the mean of its divisors is an integer number (117040357).

Almost surely, 2^668802020 is an apocalyptic number.

It is an amenable number.

668802020 is an abundant number, since it is smaller than the sum of its proper divisors (735682264).

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

668802020 is a wasteful number, since it uses less digits than its factorization.

668802020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33440110 (or 33440108 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 668802020 is about 25861.2068550561. The cubic root of 668802020 is about 874.5121721596.

The spelling of 668802020 in words is "six hundred sixty-eight million, eight hundred two thousand, twenty".