1220331220 has 48 divisors (see below), whose sum is σ = 2613643200. Its totient is φ = 478476800.

The previous prime is 1220331197. The next prime is 1220331227. The reversal of 1220331220 is 221330221.

It is a junction number, because it is equal to n+sod(n) for n = 1220331194 and 1220331203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220331227) 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, 471891 + ... + 474469.

It is an arithmetic number, because the mean of its divisors is an integer number (54450900).

Almost surely, 2^1220331220 is an apocalyptic number.

1220331220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220331220 is an abundant number, since it is smaller than the sum of its proper divisors (1393311980).

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

1220331220 is a wasteful number, since it uses less digits than its factorization.

1220331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048 (or 3046 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1220331220 is about 34933.2394718841. The cubic root of 1220331220 is about 1068.6264204203.

Adding to 1220331220 its reverse (221330221), we get a palindrome (1441661441).

Subtracting from 1220331220 its reverse (221330221), we obtain a palindrome (999000999).

The spelling of 1220331220 in words is "one billion, two hundred twenty million, three hundred thirty-one thousand, two hundred twenty".