20131332220 has 48 divisors (see below), whose sum is σ = 43459718400. Its totient is φ = 7827439104.

The previous prime is 20131332217. The next prime is 20131332233. The reversal of 20131332220 is 2223313102.

It is a congruent number.

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, 799381 + ... + 824179.

It is an arithmetic number, because the mean of its divisors is an integer number (905410800).

Almost surely, 2^20131332220 is an apocalyptic number.

20131332220 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 20131332220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21729859200).

20131332220 is an abundant number, since it is smaller than the sum of its proper divisors (23328386180).

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

20131332220 is a wasteful number, since it uses less digits than its factorization.

20131332220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25942 (or 25940 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 20131332220 its reverse (2223313102), we get a palindrome (22354645322).

The spelling of 20131332220 in words is "twenty billion, one hundred thirty-one million, three hundred thirty-two thousand, two hundred twenty".