20609136 has 60 divisors (see below), whose sum is σ = 58090032. Its totient is φ = 6820608.

The previous prime is 20609131. The next prime is 20609137. The reversal of 20609136 is 63190602.

It is a happy number.

20609136 is a `hidden beast` number, since 20 + 609 + 1 + 36 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20609131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23620 + ... + 24476.

Almost surely, 2^20609136 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 20609136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29045016).

20609136 is an abundant number, since it is smaller than the sum of its proper divisors (37480896).

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

20609136 is a wasteful number, since it uses less digits than its factorization.

20609136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038 (or 1029 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20609136 is about 4539.7286262507. The cubic root of 20609136 is about 274.1699976909.

Adding to 20609136 its reverse (63190602), we get a palindrome (83799738).

The spelling of 20609136 in words is "twenty million, six hundred nine thousand, one hundred thirty-six".