1320220500 has 96 divisors (see below), whose sum is σ = 3938433408. Its totient is φ = 343456000.

The previous prime is 1320220481. The next prime is 1320220523. The reversal of 1320220500 is 50220231.

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 1320220500.

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 31 ways as a sum of consecutive naturals, for example, 50767 + ... + 72233.

It is an arithmetic number, because the mean of its divisors is an integer number (41025348).

Almost surely, 2^1320220500 is an apocalyptic number.

1320220500 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 1320220500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1969216704).

1320220500 is an abundant number, since it is smaller than the sum of its proper divisors (2618212908).

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

1320220500 is a wasteful number, since it uses less digits than its factorization.

1320220500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21530 (or 21518 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 1320220500 is about 36334.8386538319. The cubic root of 1320220500 is about 1097.0223878860.

Adding to 1320220500 its reverse (50220231), we get a palindrome (1370440731).

The spelling of 1320220500 in words is "one billion, three hundred twenty million, two hundred twenty thousand, five hundred".