20689912 has 16 divisors (see below), whose sum is σ = 39740400. Its totient is φ = 10092480.

The previous prime is 20689909. The next prime is 20689913. The reversal of 20689912 is 21998602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689913) 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, 31212 + ... + 31867.

It is an arithmetic number, because the mean of its divisors is an integer number (2483775).

Almost surely, 2^20689912 is an apocalyptic number.

It is an amenable number.

20689912 is a deficient number, since it is larger than the sum of its proper divisors (19050488).

20689912 is a wasteful number, since it uses less digits than its factorization.

20689912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63126 (or 63122 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 20689912 is about 4548.6164929570. The cubic root of 20689912 is about 274.5277271448.

The spelling of 20689912 in words is "twenty million, six hundred eighty-nine thousand, nine hundred twelve".