20107216 has 20 divisors (see below), whose sum is σ = 39246372. Its totient is φ = 9979136.

The previous prime is 20107207. The next prime is 20107223. The reversal of 20107216 is 61270102.

It can be written as a sum of positive squares in 2 ways, for example, as 4928400 + 15178816 = 2220^2 + 3896^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20107193 and 20107202.

It is a congruent number.

It is an unprimeable number.

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, 2395 + ... + 6778.

Almost surely, 2^20107216 is an apocalyptic number.

It is an amenable number.

20107216 is a deficient number, since it is larger than the sum of its proper divisors (19139156).

20107216 is a wasteful number, since it uses less digits than its factorization.

20107216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9318 (or 9312 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20107216 is about 4484.1070460015. The cubic root of 20107216 is about 271.9259458146.

Adding to 20107216 its reverse (61270102), we get a palindrome (81377318).

The spelling of 20107216 in words is "twenty million, one hundred seven thousand, two hundred sixteen".