13533323220 has 72 divisors (see below), whose sum is σ = 41067981864. Its totient is φ = 3607400448.

The previous prime is 13533323189. The next prime is 13533323269. The reversal of 13533323220 is 2232333531.

13533323220 is a `hidden beast` number, since 1 + 3 + 5 + 3 + 332 + 322 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 353364804 + 13179958416 = 18798^2 + 114804^2 .

It is a congruent number.

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, 464112 + ... + 492408.

It is an arithmetic number, because the mean of its divisors is an integer number (570388637).

Almost surely, 2^13533323220 is an apocalyptic number.

13533323220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13533323220 is an abundant number, since it is smaller than the sum of its proper divisors (27534658644).

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

13533323220 is a wasteful number, since it uses less digits than its factorization.

13533323220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30969 (or 30964 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 27.

Adding to 13533323220 its reverse (2232333531), we get a palindrome (15765656751).

The spelling of 13533323220 in words is "thirteen billion, five hundred thirty-three million, three hundred twenty-three thousand, two hundred twenty".