20709116 has 12 divisors (see below), whose sum is σ = 37410240. Its totient is φ = 10020480.

The previous prime is 20709089. The next prime is 20709121. The reversal of 20709116 is 61190702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83381 + ... + 83628.

It is an arithmetic number, because the mean of its divisors is an integer number (3117520).

Almost surely, 2^20709116 is an apocalyptic number.

It is an amenable number.

20709116 is a deficient number, since it is larger than the sum of its proper divisors (16701124).

20709116 is a wasteful number, since it uses less digits than its factorization.

20709116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167044 (or 167042 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 20709116 is about 4550.7269748909. The cubic root of 20709116 is about 274.6126380936.

Adding to 20709116 its reverse (61190702), we get a palindrome (81899818).

The spelling of 20709116 in words is "twenty million, seven hundred nine thousand, one hundred sixteen".