20666136 has 16 divisors (see below), whose sum is σ = 51665400. Its totient is φ = 6888704.

The previous prime is 20666111. The next prime is 20666143. The reversal of 20666136 is 63166602.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 430521 + ... + 430568.

Almost surely, 2^20666136 is an apocalyptic number.

It is an amenable number.

20666136 is an abundant number, since it is smaller than the sum of its proper divisors (30999264).

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

20666136 is a wasteful number, since it uses less digits than its factorization.

20666136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861098 (or 861094 counting only the distinct ones).

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

The square root of 20666136 is about 4546.0021997355. The cubic root of 20666136 is about 274.4225281620.

It can be divided in two parts, 20666 and 136, that added together give a palindrome (20802).

The spelling of 20666136 in words is "twenty million, six hundred sixty-six thousand, one hundred thirty-six".