133303220 has 24 divisors (see below), whose sum is σ = 282826824. Its totient is φ = 52770816.

The previous prime is 133303217. The next prime is 133303237. The reversal of 133303220 is 22303331.

It can be written as a sum of positive squares in 4 ways, for example, as 7997584 + 125305636 = 2828^2 + 11194^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32417 + ... + 36296.

It is an arithmetic number, because the mean of its divisors is an integer number (11784451).

Almost surely, 2^133303220 is an apocalyptic number.

133303220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133303220 is an abundant number, since it is smaller than the sum of its proper divisors (149523604).

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

133303220 is a wasteful number, since it uses less digits than its factorization.

133303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68819 (or 68817 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 133303220 is about 11545.7013645772. The cubic root of 133303220 is about 510.8344918143.

Adding to 133303220 its reverse (22303331), we get a palindrome (155606551).

The spelling of 133303220 in words is "one hundred thirty-three million, three hundred three thousand, two hundred twenty".