720657020 has 12 divisors (see below), whose sum is σ = 1513379784. Its totient is φ = 288262800.

The previous prime is 720657017. The next prime is 720657053. The reversal of 720657020 is 20756027.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 18016406 + ... + 18016445.

It is an arithmetic number, because the mean of its divisors is an integer number (126114982).

Almost surely, 2^720657020 is an apocalyptic number.

It is an amenable number.

720657020 is an abundant number, since it is smaller than the sum of its proper divisors (792722764).

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

720657020 is a wasteful number, since it uses less digits than its factorization.

720657020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36032860 (or 36032858 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 720657020 is about 26845.0557831419. The cubic root of 720657020 is about 896.5534935145.

The spelling of 720657020 in words is "seven hundred twenty million, six hundred fifty-seven thousand, twenty".