20689316 has 24 divisors (see below), whose sum is σ = 36879360. Its totient is φ = 10154592.

The previous prime is 20689313. The next prime is 20689343. The reversal of 20689316 is 61398602.

It is not an unprimeable number, because it can be changed into a prime (20689313) 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 7 ways as a sum of consecutive naturals, for example, 70466 + ... + 70758.

It is an arithmetic number, because the mean of its divisors is an integer number (1536640).

Almost surely, 2^20689316 is an apocalyptic number.

It is an amenable number.

20689316 is a deficient number, since it is larger than the sum of its proper divisors (16190044).

20689316 is a wasteful number, since it uses less digits than its factorization.

20689316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20689316 is about 4548.5509780588. The cubic root of 20689316 is about 274.5250910760.

The spelling of 20689316 in words is "twenty million, six hundred eighty-nine thousand, three hundred sixteen".