1320220544 has 64 divisors (see below), whose sum is σ = 2792005200. Its totient is φ = 619683840.

The previous prime is 1320220523. The next prime is 1320220547. The reversal of 1320220544 is 4450220231.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320220547) 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, 1607654 + ... + 1608474.

Almost surely, 2^1320220544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320220544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396002600).

1320220544 is an abundant number, since it is smaller than the sum of its proper divisors (1471784656).

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

1320220544 is an equidigital number, since it uses as much as digits as its factorization.

1320220544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1579 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 1320220544 is about 36334.8392593114. The cubic root of 1320220544 is about 1097.0224000731.

Adding to 1320220544 its reverse (4450220231), we get a palindrome (5770440775).

The spelling of 1320220544 in words is "one billion, three hundred twenty million, two hundred twenty thousand, five hundred forty-four".