133231020 has 48 divisors (see below), whose sum is σ = 401745120. Its totient is φ = 32795136.

The previous prime is 133231013. The next prime is 133231073. The reversal of 133231020 is 20132331.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84625 + ... + 86184.

It is an arithmetic number, because the mean of its divisors is an integer number (8369690).

Almost surely, 2^133231020 is an apocalyptic number.

133231020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133231020 is an abundant number, since it is smaller than the sum of its proper divisors (268514100).

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

133231020 is a wasteful number, since it uses less digits than its factorization.

133231020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170834 (or 170832 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 133231020 is about 11542.5742362785. The cubic root of 133231020 is about 510.7422487035.

Adding to 133231020 its reverse (20132331), we get a palindrome (153363351).

The spelling of 133231020 in words is "one hundred thirty-three million, two hundred thirty-one thousand, twenty".