20320212220 has 96 divisors (see below), whose sum is σ = 53729174016. Its totient is φ = 6270816000.

The previous prime is 20320212193. The next prime is 20320212221. The reversal of 20320212220 is 2221202302.

It is a super-2 number, since 2×20320212220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20320212194 and 20320212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320212221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90219 + ... + 220861.

It is an arithmetic number, because the mean of its divisors is an integer number (559678896).

Almost surely, 2^20320212220 is an apocalyptic number.

20320212220 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 20320212220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26864587008).

20320212220 is an abundant number, since it is smaller than the sum of its proper divisors (33408961796).

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

20320212220 is a wasteful number, since it uses less digits than its factorization.

20320212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130771 (or 130769 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20320212220 its reverse (2221202302), we get a palindrome (22541414522).

The spelling of 20320212220 in words is "twenty billion, three hundred twenty million, two hundred twelve thousand, two hundred twenty".