665307020 has 24 divisors (see below), whose sum is σ = 1596737184. Its totient is φ = 228105216.

The previous prime is 665307017. The next prime is 665307029. The reversal of 665307020 is 20703566.

It is a super-2 number, since 2×665307020² = 885266861722560800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665307029) by changing a digit.

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, 2375957 + ... + 2376236.

It is an arithmetic number, because the mean of its divisors is an integer number (66530716).

Almost surely, 2^665307020 is an apocalyptic number.

It is an amenable number.

665307020 is an abundant number, since it is smaller than the sum of its proper divisors (931430164).

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

665307020 is a wasteful number, since it uses less digits than its factorization.

665307020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4752209 (or 4752207 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 665307020 is about 25793.5460919975. The cubic root of 665307020 is about 872.9861801610.

The spelling of 665307020 in words is "six hundred sixty-five million, three hundred seven thousand, twenty".