20321320120 has 64 divisors (see below), whose sum is σ = 47084922720. Its totient is φ = 7888817664.

The previous prime is 20321320099. The next prime is 20321320127. The reversal of 20321320120 is 2102312302.

It is a junction number, because it is equal to n+sod(n) for n = 20321320094 and 20321320103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321320127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232414 + ... + 307666.

Almost surely, 2^20321320120 is an apocalyptic number.

20321320120 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 20321320120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23542461360).

20321320120 is an abundant number, since it is smaller than the sum of its proper divisors (26763602600).

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

20321320120 is a wasteful number, since it uses less digits than its factorization.

20321320120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75464 (or 75460 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 20321320120 its reverse (2102312302), we get a palindrome (22423632422).

The spelling of 20321320120 in words is "twenty billion, three hundred twenty-one million, three hundred twenty thousand, one hundred twenty".