133231012020 has 36 divisors (see below), whose sum is σ = 404134070340. Its totient is φ = 35528269824.

The previous prime is 133231012003. The next prime is 133231012063. The reversal of 133231012020 is 20210132331.

133231012020 is a `hidden beast` number, since 1 + 332 + 310 + 1 + 2 + 0 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 35770913424 + 97460098596 = 189132^2 + 312186^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 133231011984 and 133231012002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 370085965 + ... + 370086324.

Almost surely, 2^133231012020 is an apocalyptic number.

133231012020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133231012020 is an abundant number, since it is smaller than the sum of its proper divisors (270903058320).

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

133231012020 is a wasteful number, since it uses less digits than its factorization.

133231012020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740172304 (or 740172299 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 133231012020 its reverse (20210132331), we get a palindrome (153441144351).

The spelling of 133231012020 in words is "one hundred thirty-three billion, two hundred thirty-one million, twelve thousand, twenty".