20004216 has 16 divisors (see below), whose sum is σ = 50010600. Its totient is φ = 6668064.

The previous prime is 20004211. The next prime is 20004217. The reversal of 20004216 is 61240002.

It is a junction number, because it is equal to n+sod(n) for n = 20004195 and 20004204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416731 + ... + 416778.

Almost surely, 2^20004216 is an apocalyptic number.

It is an amenable number.

20004216 is an abundant number, since it is smaller than the sum of its proper divisors (30006384).

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

20004216 is a wasteful number, since it uses less digits than its factorization.

20004216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833518 (or 833514 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20004216 is about 4472.6072932910. The cubic root of 20004216 is about 271.4608336272.

Adding to 20004216 its reverse (61240002), we get a palindrome (81244218).

It can be divided in two parts, 2000 and 4216, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 20004216 in words is "twenty million, four thousand, two hundred sixteen".