20430404320 has 96 divisors (see below), whose sum is σ = 48878968320. Its totient is φ = 8068999680.

The previous prime is 20430404299. The next prime is 20430404333. The reversal of 20430404320 is 2340403402.

It is a junction number, because it is equal to n+sod(n) for n = 20430404291 and 20430404300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6244285 + ... + 6247555.

It is an arithmetic number, because the mean of its divisors is an integer number (509155920).

Almost surely, 2^20430404320 is an apocalyptic number.

20430404320 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 20430404320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24439484160).

20430404320 is an abundant number, since it is smaller than the sum of its proper divisors (28448564000).

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

20430404320 is a wasteful number, since it uses less digits than its factorization.

20430404320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3768 (or 3760 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 22.

Adding to 20430404320 its reverse (2340403402), we get a palindrome (22770807722).

The spelling of 20430404320 in words is "twenty billion, four hundred thirty million, four hundred four thousand, three hundred twenty".