306720220 has 12 divisors (see below), whose sum is σ = 644112504. Its totient is φ = 122688080.

The previous prime is 306720209. The next prime is 306720229. The reversal of 306720220 is 22027603.

It is a junction number, because it is equal to n+sod(n) for n = 306720191 and 306720200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306720229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7667986 + ... + 7668025.

It is an arithmetic number, because the mean of its divisors is an integer number (53676042).

Almost surely, 2^306720220 is an apocalyptic number.

It is an amenable number.

306720220 is an abundant number, since it is smaller than the sum of its proper divisors (337392284).

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

306720220 is a wasteful number, since it uses less digits than its factorization.

306720220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15336020 (or 15336018 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 306720220 is about 17513.4297040871. The cubic root of 306720220 is about 674.3946800087.

Adding to 306720220 its reverse (22027603), we get a palindrome (328747823).

The spelling of 306720220 in words is "three hundred six million, seven hundred twenty thousand, two hundred twenty".