66330020 has 24 divisors (see below), whose sum is σ = 139822200. Its totient is φ = 26431232.

The previous prime is 66330001. The next prime is 66330023. The reversal of 66330020 is 2003366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6360484 + 59969536 = 2522^2 + 7744^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 66329974 and 66330001.

It is not an unprimeable number, because it can be changed into a prime (66330023) 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, 785 + ... + 11544.

It is an arithmetic number, because the mean of its divisors is an integer number (5825925).

Almost surely, 2^66330020 is an apocalyptic number.

It is an amenable number.

66330020 is an abundant number, since it is smaller than the sum of its proper divisors (73492180).

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

66330020 is a wasteful number, since it uses less digits than its factorization.

66330020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12607 (or 12605 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 66330020 is about 8144.3244041480. The cubic root of 66330020 is about 404.7964632920.

Adding to 66330020 its reverse (2003366), we get a palindrome (68333386).

The spelling of 66330020 in words is "sixty-six million, three hundred thirty thousand, twenty".