20166636 has 36 divisors (see below), whose sum is σ = 54739608. Its totient is φ = 5761728.

The previous prime is 20166631. The next prime is 20166637. The reversal of 20166636 is 63666102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20166631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16561 + ... + 17736.

Almost surely, 2^20166636 is an apocalyptic number.

It is an amenable number.

20166636 is an abundant number, since it is smaller than the sum of its proper divisors (34572972).

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

20166636 is a wasteful number, since it uses less digits than its factorization.

20166636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34318 (or 34309 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 20166636 is about 4490.7277806609. The cubic root of 20166636 is about 272.1935437665.

It can be divided in two parts, 20166 and 636, that added together give a palindrome (20802).

The spelling of 20166636 in words is "twenty million, one hundred sixty-six thousand, six hundred thirty-six".