20120343320 has 128 divisors (see below), whose sum is σ = 57001190400. Its totient is φ = 6209088000.

The previous prime is 20120343281. The next prime is 20120343337. The reversal of 20120343320 is 2334302102.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20120343292 and 20120343301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 278741 + ... + 343419.

It is an arithmetic number, because the mean of its divisors is an integer number (445321800).

Almost surely, 2^20120343320 is an apocalyptic number.

20120343320 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 20120343320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28500595200).

20120343320 is an abundant number, since it is smaller than the sum of its proper divisors (36880847080).

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

20120343320 is a wasteful number, since it uses less digits than its factorization.

20120343320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64809 (or 64805 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 20120343320 its reverse (2334302102), we get a palindrome (22454645422).

The spelling of 20120343320 in words is "twenty billion, one hundred twenty million, three hundred forty-three thousand, three hundred twenty".