20746636 has 6 divisors (see below), whose sum is σ = 36306620. Its totient is φ = 10373316.

The previous prime is 20746631. The next prime is 20746639. The reversal of 20746636 is 63664702.

It is not an unprimeable number, because it can be changed into a prime (20746631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2593326 + ... + 2593333.

Almost surely, 2^20746636 is an apocalyptic number.

It is an amenable number.

20746636 is a deficient number, since it is larger than the sum of its proper divisors (15559984).

20746636 is a wasteful number, since it uses less digits than its factorization.

20746636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5186663 (or 5186661 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 20746636 is about 4554.8475276347. The cubic root of 20746636 is about 274.7783823317.

The spelling of 20746636 in words is "twenty million, seven hundred forty-six thousand, six hundred thirty-six".