133503220 has 12 divisors (see below), whose sum is σ = 280356804. Its totient is φ = 53401280.

The previous prime is 133503191. The next prime is 133503229. The reversal of 133503220 is 22305331.

It can be written as a sum of positive squares in 2 ways, for example, as 59783824 + 73719396 = 7732^2 + 8586^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133503229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3337561 + ... + 3337600.

It is an arithmetic number, because the mean of its divisors is an integer number (23363067).

Almost surely, 2^133503220 is an apocalyptic number.

133503220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133503220 is an abundant number, since it is smaller than the sum of its proper divisors (146853584).

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

133503220 is a wasteful number, since it uses less digits than its factorization.

133503220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6675170 (or 6675168 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 133503220 is about 11554.3593504789. The cubic root of 133503220 is about 511.0898390993.

Adding to 133503220 its reverse (22305331), we get a palindrome (155808551).

The spelling of 133503220 in words is "one hundred thirty-three million, five hundred three thousand, two hundred twenty".