1220203305 has 64 divisors (see below), whose sum is σ = 2304806400. Its totient is φ = 610375680.

The previous prime is 1220203297. The next prime is 1220203349. The reversal of 1220203305 is 5033020221.

It is not a de Polignac number, because 1220203305 - 2³ = 1220203297 is a prime.

It is a super-2 number, since 2×1220203305² = 2977792211065846050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 823165 + ... + 824645.

It is an arithmetic number, because the mean of its divisors is an integer number (36012600).

Almost surely, 2^1220203305 is an apocalyptic number.

1220203305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220203305 is a deficient number, since it is larger than the sum of its proper divisors (1084603095).

1220203305 is a wasteful number, since it uses less digits than its factorization.

1220203305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871 (or 1865 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 1220203305 is about 34931.4085745193. The cubic root of 1220203305 is about 1068.5890813431.

Adding to 1220203305 its reverse (5033020221), we get a palindrome (6253223526).

The spelling of 1220203305 in words is "one billion, two hundred twenty million, two hundred three thousand, three hundred five".