20689712 has 20 divisors (see below), whose sum is σ = 40502616. Its totient is φ = 10237440.

The previous prime is 20689709. The next prime is 20689763. The reversal of 20689712 is 21798602.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 5114 + ... + 8217.

Almost surely, 2^20689712 is an apocalyptic number.

It is an amenable number.

20689712 is a deficient number, since it is larger than the sum of its proper divisors (19812904).

20689712 is a wasteful number, since it uses less digits than its factorization.

20689712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13436 (or 13430 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20689712 is about 4548.5945081970. The cubic root of 20689712 is about 274.5268425636.

The spelling of 20689712 in words is "twenty million, six hundred eighty-nine thousand, seven hundred twelve".