20331303331220 has 144 divisors (see below), whose sum is σ = 52288786186560. Its totient is φ = 6602804522496.

The previous prime is 20331303331187. The next prime is 20331303331249. The reversal of 20331303331220 is 2213330313302.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20331303331220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121933547 + ... + 122100173.

It is an arithmetic number, because the mean of its divisors is an integer number (363116570740).

Almost surely, 2^{20331303331220} is an apocalyptic number.

20331303331220 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 20331303331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26144393093280).

20331303331220 is an abundant number, since it is smaller than the sum of its proper divisors (31957482855340).

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

20331303331220 is a wasteful number, since it uses less digits than its factorization.

20331303331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173222 (or 173213 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 26.

Adding to 20331303331220 its reverse (2213330313302), we get a palindrome (22544633644522).

The spelling of 20331303331220 in words is "twenty trillion, three hundred thirty-one billion, three hundred three million, three hundred thirty-one thousand, two hundred twenty".