660700020 has 24 divisors (see below), whose sum is σ = 1849960224. Its totient is φ = 176186656.

The previous prime is 660700013. The next prime is 660700043. The reversal of 660700020 is 20007066.

It is a self number, because there is not a number n which added to its sum of digits gives 660700020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5505774 + ... + 5505893.

It is an arithmetic number, because the mean of its divisors is an integer number (77081676).

Almost surely, 2^660700020 is an apocalyptic number.

660700020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

660700020 is an abundant number, since it is smaller than the sum of its proper divisors (1189260204).

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

660700020 is a wasteful number, since it uses less digits than its factorization.

660700020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11011679 (or 11011677 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 660700020 is about 25704.0856674576. The cubic root of 660700020 is about 870.9664778043.

Adding to 660700020 its reverse (20007066), we get a palindrome (680707086).

The spelling of 660700020 in words is "six hundred sixty million, seven hundred thousand, twenty".