20636018 has 16 divisors (see below), whose sum is σ = 34411776. Its totient is φ = 9216720.

The previous prime is 20636009. The next prime is 20636029. The reversal of 20636018 is 81063602.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 11996 + ... + 13607.

It is an arithmetic number, because the mean of its divisors is an integer number (2150736).

Almost surely, 2^20636018 is an apocalyptic number.

20636018 is a deficient number, since it is larger than the sum of its proper divisors (13775758).

20636018 is a wasteful number, since it uses less digits than its factorization.

20636018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25649.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20636018 is about 4542.6884110623. The cubic root of 20636018 is about 274.2891525435.

The spelling of 20636018 in words is "twenty million, six hundred thirty-six thousand, eighteen".