20131233212220 has 192 divisors, whose sum is σ = 62101960381440. Its totient is φ = 4842219128832.

The previous prime is 20131233212119. The next prime is 20131233212227. The reversal of 20131233212220 is 2221233213102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131233212227) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6375624 + ... + 8995056.

It is an arithmetic number, because the mean of its divisors is an integer number (323447710320).

Almost surely, 2^{20131233212220} is an apocalyptic number.

20131233212220 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 20131233212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31050980190720).

20131233212220 is an abundant number, since it is smaller than the sum of its proper divisors (41970727169220).

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

20131233212220 is a wasteful number, since it uses less digits than its factorization.

20131233212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619684 (or 2619682 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 20131233212220 its reverse (2221233213102), we get a palindrome (22352466425322).

The spelling of 20131233212220 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirty-three million, two hundred twelve thousand, two hundred twenty".