660323020 has 60 divisors (see below), whose sum is σ = 1617812784. Its totient is φ = 226380000.

The previous prime is 660322997. The next prime is 660323021. The reversal of 660323020 is 20323066.

It is a junction number, because it is equal to n+sod(n) for n = 660322982 and 660323000.

It is not an unprimeable number, because it can be changed into a prime (660323021) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41145 + ... + 54895.

Almost surely, 2^660323020 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 660323020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808906392).

660323020 is an abundant number, since it is smaller than the sum of its proper divisors (957489764).

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

660323020 is a wasteful number, since it uses less digits than its factorization.

660323020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13788 (or 13765 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 660323020 is about 25696.7511565178. The cubic root of 660323020 is about 870.8007864538.

Adding to 660323020 its reverse (20323066), we get a palindrome (680646086).

The spelling of 660323020 in words is "six hundred sixty million, three hundred twenty-three thousand, twenty".