306207220 has 48 divisors (see below), whose sum is σ = 702955008. Its totient is φ = 111116160.

The previous prime is 306207203. The next prime is 306207221. The reversal of 306207220 is 22702603.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 306207191 and 306207200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306207221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132394 + ... + 134686.

It is an arithmetic number, because the mean of its divisors is an integer number (14644896).

Almost surely, 2^306207220 is an apocalyptic number.

It is an amenable number.

306207220 is an abundant number, since it is smaller than the sum of its proper divisors (396747788).

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

306207220 is a wasteful number, since it uses less digits than its factorization.

306207220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2918 counting only the distinct ones).

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

The square root of 306207220 is about 17498.7776715975. Note that the first 3 decimals coincide. The cubic root of 306207220 is about 674.0184875193.

Adding to 306207220 its reverse (22702603), we get a palindrome (328909823).

The spelling of 306207220 in words is "three hundred six million, two hundred seven thousand, two hundred twenty".