20430396 has 144 divisors (see below), whose sum is σ = 66044160. Its totient is φ = 5184000.

The previous prime is 20430373. The next prime is 20430409. The reversal of 20430396 is 69303402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81271 + ... + 81521.

It is an arithmetic number, because the mean of its divisors is an integer number (458640).

Almost surely, 2^20430396 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20430396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33022080).

20430396 is an abundant number, since it is smaller than the sum of its proper divisors (45613764).

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

20430396 is a wasteful number, since it uses less digits than its factorization.

20430396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 20430396 is about 4519.9995575221. Note that the first 3 decimals coincide. The cubic root of 20430396 is about 273.3750831858.

Adding to 20430396 its reverse (69303402), we get a palindrome (89733798).

The spelling of 20430396 in words is "twenty million, four hundred thirty thousand, three hundred ninety-six".