220321020 has 96 divisors (see below), whose sum is σ = 664082496. Its totient is φ = 54374400.

The previous prime is 220321009. The next prime is 220321021. The reversal of 220321020 is 20123022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 220320987 and 220321005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220321021) 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, 60450 + ... + 63990.

It is an arithmetic number, because the mean of its divisors is an integer number (6917526).

Almost surely, 2^220321020 is an apocalyptic number.

220321020 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 220321020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332041248).

220321020 is an abundant number, since it is smaller than the sum of its proper divisors (443761476).

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

220321020 is a wasteful number, since it uses less digits than its factorization.

220321020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631 (or 3629 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 220321020 is about 14843.2146113974. The cubic root of 220321020 is about 603.9745577927.

Adding to 220321020 its reverse (20123022), we get a palindrome (240444042).

The spelling of 220321020 in words is "two hundred twenty million, three hundred twenty-one thousand, twenty".