133043220 has 72 divisors (see below), whose sum is σ = 407326920. Its totient is φ = 35147520.

The previous prime is 133043191. The next prime is 133043269. The reversal of 133043220 is 22340331.

It can be written as a sum of positive squares in 4 ways, for example, as 19236996 + 113806224 = 4386^2 + 10668^2 .

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 = 133043193 and 133043202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16230 + ... + 23010.

Almost surely, 2^133043220 is an apocalyptic number.

133043220 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 133043220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (203663460).

133043220 is an abundant number, since it is smaller than the sum of its proper divisors (274283700).

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

133043220 is a wasteful number, since it uses less digits than its factorization.

133043220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6905 (or 6900 counting only the distinct ones).

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

The square root of 133043220 is about 11534.4362671090. The cubic root of 133043220 is about 510.5021582265.

Adding to 133043220 its reverse (22340331), we get a palindrome (155383551).

The spelling of 133043220 in words is "one hundred thirty-three million, forty-three thousand, two hundred twenty".