6720812020 has 24 divisors (see below), whose sum is σ = 15199375464. Its totient is φ = 2481530496.

The previous prime is 6720812003. The next prime is 6720812057. The reversal of 6720812020 is 202180276.

It can be written as a sum of positive squares in 4 ways, for example, as 280428516 + 6440383504 = 16746^2 + 80252^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6720812020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12924379 + ... + 12924898.

It is an arithmetic number, because the mean of its divisors is an integer number (633307311).

Almost surely, 2^6720812020 is an apocalyptic number.

It is an amenable number.

6720812020 is an abundant number, since it is smaller than the sum of its proper divisors (8478563444).

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

6720812020 is a wasteful number, since it uses less digits than its factorization.

6720812020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25849299 (or 25849297 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 6720812020 is about 81980.5587929236. The cubic root of 6720812020 is about 1887.1535982293.

Adding to 6720812020 its reverse (202180276), we get a palindrome (6922992296).

The spelling of 6720812020 in words is "six billion, seven hundred twenty million, eight hundred twelve thousand, twenty".