660305020 has 24 divisors (see below), whose sum is σ = 1388578464. Its totient is φ = 263752896.

The previous prime is 660305017. The next prime is 660305029. The reversal of 660305020 is 20503066.

It is a junction number, because it is equal to n+sod(n) for n = 660304982 and 660305000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660305029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8167 + ... + 37246.

It is an arithmetic number, because the mean of its divisors is an integer number (57857436).

Almost surely, 2^660305020 is an apocalyptic number.

It is an amenable number.

660305020 is an abundant number, since it is smaller than the sum of its proper divisors (728273444).

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

660305020 is a wasteful number, since it uses less digits than its factorization.

660305020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46149 (or 46147 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 660305020 is about 25696.4009153033. The cubic root of 660305020 is about 870.7928738837.

Adding to 660305020 its reverse (20503066), we get a palindrome (680808086).

The spelling of 660305020 in words is "six hundred sixty million, three hundred five thousand, twenty".