20131233122220 has 384 divisors, whose sum is σ = 68575448309760. Its totient is φ = 4348951326720.

The previous prime is 20131233122179. The next prime is 20131233122249. The reversal of 20131233122220 is 2222133213102.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 380073459 + ... + 380126421.

It is an arithmetic number, because the mean of its divisors is an integer number (178581896640).

Almost surely, 2^{20131233122220} is an apocalyptic number.

20131233122220 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 20131233122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34287724154880).

20131233122220 is an abundant number, since it is smaller than the sum of its proper divisors (48444215187540).

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

20131233122220 is a wasteful number, since it uses less digits than its factorization.

20131233122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54805 (or 54803 counting only the distinct ones).

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

Adding to 20131233122220 its reverse (2222133213102), we get a palindrome (22353366335322).

The spelling of 20131233122220 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirty-three million, one hundred twenty-two thousand, two hundred twenty".