20136688 has 60 divisors (see below), whose sum is σ = 46155528. Its totient is φ = 8436480.

The previous prime is 20136679. The next prime is 20136703. The reversal of 20136688 is 88663102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29406 + ... + 30082.

Almost surely, 2^20136688 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 20136688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23077764).

20136688 is an abundant number, since it is smaller than the sum of its proper divisors (26018840).

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

20136688 is a wasteful number, since it uses less digits than its factorization.

20136688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20136688 is about 4487.3921156948. The cubic root of 20136688 is about 272.0587387561.

The spelling of 20136688 in words is "twenty million, one hundred thirty-six thousand, six hundred eighty-eight".