20321122220 has 72 divisors (see below), whose sum is σ = 50081177664. Its totient is φ = 6905547264.

The previous prime is 20321122189. The next prime is 20321122223. The reversal of 20321122220 is 2222112302.

It is not an unprimeable number, because it can be changed into a prime (20321122223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18989 + ... + 202491.

It is an arithmetic number, because the mean of its divisors is an integer number (695571912).

Almost surely, 2^20321122220 is an apocalyptic number.

20321122220 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 20321122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25040588832).

20321122220 is an abundant number, since it is smaller than the sum of its proper divisors (29760055444).

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

20321122220 is a wasteful number, since it uses less digits than its factorization.

20321122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183639 (or 183630 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20321122220 its reverse (2222112302), we get a palindrome (22543234522).

The spelling of 20321122220 in words is "twenty billion, three hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".