20718036 has 72 divisors (see below), whose sum is σ = 56183400. Its totient is φ = 6414336.

The previous prime is 20718031. The next prime is 20718073. The reversal of 20718036 is 63081702.

20718036 = T₁₁₃ + T₁₁₄ + ... + T₅₀₀.

It can be written as a sum of positive squares in 4 ways, for example, as 7322436 + 13395600 = 2706^2 + 3660^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718031) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 59190 + ... + 59538.

It is an arithmetic number, because the mean of its divisors is an integer number (780325).

Almost surely, 2^20718036 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 20718036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28091700).

20718036 is an abundant number, since it is smaller than the sum of its proper divisors (35465364).

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

20718036 is a wasteful number, since it uses less digits than its factorization.

20718036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473 (or 468 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20718036 is about 4551.7069325694. The cubic root of 20718036 is about 274.6520602354.

Adding to 20718036 its reverse (63081702), we get a palindrome (83799738).

The spelling of 20718036 in words is "twenty million, seven hundred eighteen thousand, thirty-six".