20430204330400 has 144 divisors (see below), whose sum is σ = 50396294055744. Its totient is φ = 8086729236480.

The previous prime is 20430204330343. The next prime is 20430204330401. The reversal of 20430204330400 is 403340203402.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (20430204330401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 794843949 + ... + 794869651.

It is an arithmetic number, because the mean of its divisors is an integer number (349974264276).

Almost surely, 2^{20430204330400} is an apocalyptic number.

20430204330400 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 20430204330400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25198147027872).

20430204330400 is an abundant number, since it is smaller than the sum of its proper divisors (29966089725344).

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

20430204330400 is a wasteful number, since it uses less digits than its factorization.

20430204330400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36063 (or 36050 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 25.

Adding to 20430204330400 its reverse (403340203402), we get a palindrome (20833544533802).

The spelling of 20430204330400 in words is "twenty trillion, four hundred thirty billion, two hundred four million, three hundred thirty thousand, four hundred".