20321320220 has 24 divisors (see below), whose sum is σ = 44146317600. Its totient is φ = 7848233792.

The previous prime is 20321320199. The next prime is 20321320223. The reversal of 20321320220 is 2202312302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321320223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17517800 + ... + 17518959.

It is an arithmetic number, because the mean of its divisors is an integer number (1839429900).

Almost surely, 2^20321320220 is an apocalyptic number.

20321320220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321320220 is an abundant number, since it is smaller than the sum of its proper divisors (23824997380).

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

20321320220 is a wasteful number, since it uses less digits than its factorization.

20321320220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35036797 (or 35036795 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 20321320220 its reverse (2202312302), we get a palindrome (22523632522).

The spelling of 20321320220 in words is "twenty billion, three hundred twenty-one million, three hundred twenty thousand, two hundred twenty".