20618136 has 96 divisors (see below), whose sum is σ = 69638400. Its totient is φ = 5353920.

The previous prime is 20618123. The next prime is 20618141. The reversal of 20618136 is 63181602.

It is a super-2 number, since 2×20618136² = 850215064228992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 3685 + ... + 7403.

It is an arithmetic number, because the mean of its divisors is an integer number (725400).

Almost surely, 2^20618136 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 20618136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34819200).

20618136 is an abundant number, since it is smaller than the sum of its proper divisors (49020264).

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

20618136 is a wasteful number, since it uses less digits than its factorization.

20618136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3749 (or 3742 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 20618136 is about 4540.7197667330. The cubic root of 20618136 is about 274.2099018525.

Adding to 20618136 its reverse (63181602), we get a palindrome (83799738).

The spelling of 20618136 in words is "twenty million, six hundred eighteen thousand, one hundred thirty-six".