20133131331220 has 96 divisors (see below), whose sum is σ = 45346262556672. Its totient is φ = 7490227586688.

The previous prime is 20133131331127. The next prime is 20133131331241. The reversal of 20133131331220 is 2213313133102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2128759 + ... + 6693121.

It is an arithmetic number, because the mean of its divisors is an integer number (472356901632).

Almost surely, 2^{20133131331220} is an apocalyptic number.

20133131331220 is a gapful number since it is divisible by the number (20) 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 20133131331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22673131278336).

20133131331220 is an abundant number, since it is smaller than the sum of its proper divisors (25213131225452).

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

20133131331220 is a wasteful number, since it uses less digits than its factorization.

20133131331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564661 (or 4564659 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 20133131331220 its reverse (2213313133102), we get a palindrome (22346444464322).

The spelling of 20133131331220 in words is "twenty trillion, one hundred thirty-three billion, one hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty".