1220131320 has 64 divisors (see below), whose sum is σ = 3679045920. Its totient is φ = 323710464.

The previous prime is 1220131273. The next prime is 1220131357. The reversal of 1220131320 is 231310221.

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 1220131320.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2167 + ... + 49446.

Almost surely, 2^1220131320 is an apocalyptic number.

1220131320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1220131320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1839522960).

1220131320 is an abundant number, since it is smaller than the sum of its proper divisors (2458914600).

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

1220131320 is a wasteful number, since it uses less digits than its factorization.

1220131320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51824 (or 51820 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1220131320 is about 34930.3781828940. The cubic root of 1220131320 is about 1068.5680673865.

Adding to 1220131320 its reverse (231310221), we get a palindrome (1451441541).

The spelling of 1220131320 in words is "one billion, two hundred twenty million, one hundred thirty-one thousand, three hundred twenty".