1320233220 has 72 divisors (see below), whose sum is σ = 4016987520. Its totient is φ = 350982720.

The previous prime is 1320233219. The next prime is 1320233237. The reversal of 1320233220 is 223320231.

It is a happy number.

1320233220 is a `hidden beast` number, since 1 + 320 + 23 + 322 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1320233193 and 1320233202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48501 + ... + 70659.

Almost surely, 2^1320233220 is an apocalyptic number.

1320233220 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 1320233220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2008493760).

1320233220 is an abundant number, since it is smaller than the sum of its proper divisors (2696754300).

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

1320233220 is a wasteful number, since it uses less digits than its factorization.

1320233220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22505 (or 22500 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 1320233220 is about 36335.0136920299. The cubic root of 1320233220 is about 1097.0259110550.

Adding to 1320233220 its reverse (223320231), we get a palindrome (1543553451).

The spelling of 1320233220 in words is "one billion, three hundred twenty million, two hundred thirty-three thousand, two hundred twenty".