20736646 has 8 divisors (see below), whose sum is σ = 35548560. Its totient is φ = 8887128.

The previous prime is 20736623. The next prime is 20736647. The reversal of 20736646 is 64663702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740581 + ... + 740608.

It is an arithmetic number, because the mean of its divisors is an integer number (4443570).

Almost surely, 2^20736646 is an apocalyptic number.

20736646 is a deficient number, since it is larger than the sum of its proper divisors (14811914).

20736646 is a wasteful number, since it uses less digits than its factorization.

20736646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481198.

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

The square root of 20736646 is about 4553.7507617348. The cubic root of 20736646 is about 274.7342711361.

The spelling of 20736646 in words is "twenty million, seven hundred thirty-six thousand, six hundred forty-six".