305012220 has 24 divisors (see below), whose sum is σ = 854034384. Its totient is φ = 81336576.

The previous prime is 305012189. The next prime is 305012233. The reversal of 305012220 is 22210503.

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 305012220.

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, 2541709 + ... + 2541828.

It is an arithmetic number, because the mean of its divisors is an integer number (35584766).

Almost surely, 2^305012220 is an apocalyptic number.

305012220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

305012220 is an abundant number, since it is smaller than the sum of its proper divisors (549022164).

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

305012220 is a wasteful number, since it uses less digits than its factorization.

305012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5083549 (or 5083547 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 305012220 is about 17464.5990506510. The cubic root of 305012220 is about 673.1405394071.

Adding to 305012220 its reverse (22210503), we get a palindrome (327222723).

The spelling of 305012220 in words is "three hundred five million, twelve thousand, two hundred twenty".