20736709 has 8 divisors (see below), whose sum is σ = 23760320. Its totient is φ = 17728416.

The previous prime is 20736691. The next prime is 20736713. The reversal of 20736709 is 90763702.

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 20736709 - 2¹³ = 20728517 is a prime.

It is a super-2 number, since 2×20736709² = 860022200301362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736739) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 759 + ... + 6484.

It is an arithmetic number, because the mean of its divisors is an integer number (2970040).

Almost surely, 2^20736709 is an apocalyptic number.

It is an amenable number.

20736709 is a deficient number, since it is larger than the sum of its proper divisors (3023611).

20736709 is an equidigital number, since it uses as much as digits as its factorization.

20736709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7659.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 20736709 is about 4553.7576791041. The cubic root of 20736709 is about 274.7345493592.

The spelling of 20736709 in words is "twenty million, seven hundred thirty-six thousand, seven hundred nine".