20216430 has 96 divisors (see below), whose sum is σ = 58260384. Its totient is φ = 4831488.

The previous prime is 20216411. The next prime is 20216447. The reversal of 20216430 is 3461202.

It is a happy number.

20216430 is a `hidden beast` number, since 2 + 0 + 21 + 643 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 43057 + ... + 43523.

It is an arithmetic number, because the mean of its divisors is an integer number (606879).

Almost surely, 2^20216430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20216430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29130192).

20216430 is an abundant number, since it is smaller than the sum of its proper divisors (38043954).

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

20216430 is a wasteful number, since it uses less digits than its factorization.

20216430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20216430 is about 4496.2684528395. The cubic root of 20216430 is about 272.4173865102.

Adding to 20216430 its reverse (3461202), we get a palindrome (23677632).

The spelling of 20216430 in words is "twenty million, two hundred sixteen thousand, four hundred thirty".