1220013220 has 24 divisors (see below), whose sum is σ = 2624518008. Its totient is φ = 476102400.

The previous prime is 1220013217. The next prime is 1220013229. The reversal of 1220013220 is 223100221.

It can be written as a sum of positive squares in 4 ways, for example, as 46539684 + 1173473536 = 6822^2 + 34256^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1220013220.

It is not an unprimeable number, because it can be changed into a prime (1220013229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743091 + ... + 744730.

It is an arithmetic number, because the mean of its divisors is an integer number (109354917).

Almost surely, 2^1220013220 is an apocalyptic number.

1220013220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220013220 is an abundant number, since it is smaller than the sum of its proper divisors (1404504788).

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

1220013220 is a wasteful number, since it uses less digits than its factorization.

1220013220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487871 (or 1487869 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 1220013220 is about 34928.6876363828. The cubic root of 1220013220 is about 1068.5335896877.

Adding to 1220013220 its reverse (223100221), we get a palindrome (1443113441).

The spelling of 1220013220 in words is "one billion, two hundred twenty million, thirteen thousand, two hundred twenty".