721056020 has 24 divisors (see below), whose sum is σ = 1603290024. Its totient is φ = 271456256.

The previous prime is 721055953. The next prime is 721056041. The reversal of 721056020 is 20650127.

721056020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6990736 + 714065284 = 2644^2 + 26722^2 .

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, 1060037 + ... + 1060716.

It is an arithmetic number, because the mean of its divisors is an integer number (66803751).

Almost surely, 2^721056020 is an apocalyptic number.

It is an amenable number.

721056020 is an abundant number, since it is smaller than the sum of its proper divisors (882234004).

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

721056020 is a wasteful number, since it uses less digits than its factorization.

721056020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120779 (or 2120777 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 721056020 is about 26852.4862908447. The cubic root of 721056020 is about 896.7189253518.

It can be divided in two parts, 72105 and 6020, that added together give a 7-th power (78125 = 5⁷).

The spelling of 721056020 in words is "seven hundred twenty-one million, fifty-six thousand, twenty".