20736818 has 16 divisors (see below), whose sum is σ = 31752216. Its totient is φ = 10154880.

The previous prime is 20736791. The next prime is 20736853. The reversal of 20736818 is 81863702.

It can be written as a sum of positive squares in 4 ways, for example, as 19598329 + 1138489 = 4427^2 + 1067^2 .

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 7 ways as a sum of consecutive naturals, for example, 24848 + ... + 25668.

Almost surely, 2^20736818 is an apocalyptic number.

20736818 is a deficient number, since it is larger than the sum of its proper divisors (11015398).

20736818 is a wasteful number, since it uses less digits than its factorization.

20736818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20736818 is about 4553.7696472264. The cubic root of 20736818 is about 274.7350307280.

It can be divided in two parts, 207368 and 18, that multiplied together give a square (3732624 = 1932²).

The spelling of 20736818 in words is "twenty million, seven hundred thirty-six thousand, eight hundred eighteen".