20006216 has 16 divisors (see below), whose sum is σ = 37562940. Its totient is φ = 9989440.

The previous prime is 20006209. The next prime is 20006219. The reversal of 20006216 is 61260002.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 168100 = 4454^2 + 410^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20006194 and 20006203.

It is not an unprimeable number, because it can be changed into a prime (20006219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7310 + ... + 9666.

Almost surely, 2^20006216 is an apocalyptic number.

It is an amenable number.

20006216 is a deficient number, since it is larger than the sum of its proper divisors (17556724).

20006216 is a wasteful number, since it uses less digits than its factorization.

20006216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3424 (or 3420 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20006216 is about 4472.8308709362. The cubic root of 20006216 is about 271.4698801131.

Adding to 20006216 its reverse (61260002), we get a palindrome (81266218).

The spelling of 20006216 in words is "twenty million, six thousand, two hundred sixteen".