6660020020 has 12 divisors (see below), whose sum is σ = 13986042084. Its totient is φ = 2664008000.

The previous prime is 6660019999. The next prime is 6660020021. The reversal of 6660020020 is 200200666.

It can be written as a sum of positive squares in 2 ways, for example, as 2212197156 + 4447822864 = 47034^2 + 66692^2 .

6660020020 is a modest number, since divided by 20020 gives 6660 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 6660019973 and 6660020000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660020021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166500481 + ... + 166500520.

It is an arithmetic number, because the mean of its divisors is an integer number (1165503507).

Almost surely, 2^6660020020 is an apocalyptic number.

It is an amenable number.

6660020020 is an abundant number, since it is smaller than the sum of its proper divisors (7326022064).

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

6660020020 is a wasteful number, since it uses less digits than its factorization.

6660020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333001010 (or 333001008 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6660020020 is about 81608.9457106266. The cubic root of 6660020020 is about 1881.4463763834.

Adding to 6660020020 its reverse (200200666), we get a palindrome (6860220686).

The spelling of 6660020020 in words is "six billion, six hundred sixty million, twenty thousand, twenty".