20686612 has 18 divisors (see below), whose sum is σ = 37076298. Its totient is φ = 10099152.

The previous prime is 20686607. The next prime is 20686613. The reversal of 20686612 is 21668602.

It can be written as a sum of positive squares in only one way, i.e., 19236996 + 1449616 = 4386^2 + 1204^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686613) 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 5 ways as a sum of consecutive naturals, for example, 5998 + ... + 8794.

Almost surely, 2^20686612 is an apocalyptic number.

It is an amenable number.

20686612 is a deficient number, since it is larger than the sum of its proper divisors (16389686).

20686612 is a wasteful number, since it uses less digits than its factorization.

20686612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2887 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20686612 is about 4548.2537308290. The cubic root of 20686612 is about 274.5131308258.

The spelling of 20686612 in words is "twenty million, six hundred eighty-six thousand, six hundred twelve".