133203720 has 128 divisors (see below), whose sum is σ = 435052800. Its totient is φ = 32431104.

The previous prime is 133203703. The next prime is 133203743. The reversal of 133203720 is 27302331.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160266 + ... + 161094.

It is an arithmetic number, because the mean of its divisors is an integer number (3398850).

Almost surely, 2^133203720 is an apocalyptic number.

133203720 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 133203720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217526400).

133203720 is an abundant number, since it is smaller than the sum of its proper divisors (301849080).

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

133203720 is a wasteful number, since it uses less digits than its factorization.

133203720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 955 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 133203720 is about 11541.3915972035. The cubic root of 133203720 is about 510.7073613931.

The spelling of 133203720 in words is "one hundred thirty-three million, two hundred three thousand, seven hundred twenty".