20609688 has 96 divisors (see below), whose sum is σ = 58222080. Its totient is φ = 6072000.

The previous prime is 20609683. The next prime is 20609707. The reversal of 20609688 is 88690602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609683) 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 23 ways as a sum of consecutive naturals, for example, 136413 + ... + 136563.

It is an arithmetic number, because the mean of its divisors is an integer number (606480).

Almost surely, 2^20609688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20609688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29111040).

20609688 is an abundant number, since it is smaller than the sum of its proper divisors (37612392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20609688 is a wasteful number, since it uses less digits than its factorization.

20609688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 20609688 is about 4539.7894224292. The cubic root of 20609688 is about 274.1724454805.

The spelling of 20609688 in words is "twenty million, six hundred nine thousand, six hundred eighty-eight".