20321231200220 has 72 divisors (see below), whose sum is σ = 43293510502704. Its totient is φ = 8012263891968.

The previous prime is 20321231200219. The next prime is 20321231200241. The reversal of 20321231200220 is 2200213212302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20321231200192 and 20321231200201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177611672 + ... + 177726048.

It is an arithmetic number, because the mean of its divisors is an integer number (601298756982).

Almost surely, 2^{20321231200220} is an apocalyptic number.

20321231200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321231200220 is an abundant number, since it is smaller than the sum of its proper divisors (22972279302484).

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

20321231200220 is a wasteful number, since it uses less digits than its factorization.

20321231200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116199 (or 116124 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20321231200220 its reverse (2200213212302), we get a palindrome (22521444412522).

The spelling of 20321231200220 in words is "twenty trillion, three hundred twenty-one billion, two hundred thirty-one million, two hundred thousand, two hundred twenty".