20342355320 has 128 divisors (see below), whose sum is σ = 55460160000. Its totient is φ = 6559667712.

The previous prime is 20342355307. The next prime is 20342355331. The reversal of 20342355320 is 2355324302.

It is a super-2 number, since 2×20342355320² (a number of 21 digits) contains 22 as substring.

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, 725726 + ... + 753234.

It is an arithmetic number, because the mean of its divisors is an integer number (433282500).

Almost surely, 2^20342355320 is an apocalyptic number.

20342355320 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 20342355320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27730080000).

20342355320 is an abundant number, since it is smaller than the sum of its proper divisors (35117804680).

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

20342355320 is a wasteful number, since it uses less digits than its factorization.

20342355320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27685 (or 27681 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 29.

Adding to 20342355320 its reverse (2355324302), we get a palindrome (22697679622).

The spelling of 20342355320 in words is "twenty billion, three hundred forty-two million, three hundred fifty-five thousand, three hundred twenty".