20036636 has 18 divisors (see below), whose sum is σ = 35693280. Its totient is φ = 9841672.

The previous prime is 20036629. The next prime is 20036677. The reversal of 20036636 is 63663002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13205 + ... + 14643.

It is an arithmetic number, because the mean of its divisors is an integer number (1982960).

Almost surely, 2^20036636 is an apocalyptic number.

It is an amenable number.

20036636 is a deficient number, since it is larger than the sum of its proper divisors (15656644).

20036636 is a wasteful number, since it uses less digits than its factorization.

20036636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561 (or 1500 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

The square root of 20036636 is about 4476.2301102602. The cubic root of 20036636 is about 271.6074028998.

Adding to 20036636 its reverse (63663002), we get a palindrome (83699638).

The spelling of 20036636 in words is "twenty million, thirty-six thousand, six hundred thirty-six".