20736505 has 8 divisors (see below), whose sum is σ = 26193600. Its totient is φ = 15716016.

The previous prime is 20736491. The next prime is 20736509. The reversal of 20736505 is 50563702.

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

It is a cyclic number.

It is not a de Polignac number, because 20736505 - 2²¹ = 18639353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20736509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109045 + ... + 109234.

It is an arithmetic number, because the mean of its divisors is an integer number (3274200).

Almost surely, 2^20736505 is an apocalyptic number.

It is an amenable number.

20736505 is a deficient number, since it is larger than the sum of its proper divisors (5457095).

20736505 is a wasteful number, since it uses less digits than its factorization.

20736505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218303.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 20736505 is about 4553.7352799652. The cubic root of 20736505 is about 274.7336484443.

The spelling of 20736505 in words is "twenty million, seven hundred thirty-six thousand, five hundred five".