720420 has 24 divisors (see below), whose sum is σ = 2017344. Its totient is φ = 192096.

The previous prime is 720413. The next prime is 720439. The reversal of 720420 is 24027.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 720420.

It is an unprimeable number.

720420 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5944 + ... + 6063.

It is an arithmetic number, because the mean of its divisors is an integer number (84056).

2⁷²⁰⁴²⁰ is an apocalyptic number.

It is an amenable number.

720420 is an abundant number, since it is smaller than the sum of its proper divisors (1296924).

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

720420 is a wasteful number, since it uses less digits than its factorization.

720420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12019 (or 12017 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 720420 is about 848.7755887159. The cubic root of 720420 is about 89.6455192287.

Adding to 720420 its reverse (24027), we get a palindrome (744447).

The spelling of 720420 in words is "seven hundred twenty thousand, four hundred twenty", and thus it is an iban number.