20736005 has 8 divisors (see below), whose sum is σ = 26347032. Its totient is φ = 15612928.

The previous prime is 20735969. The next prime is 20736017. The reversal of 20736005 is 50063702.

It can be written as a sum of positive squares in 4 ways, for example, as 4879681 + 15856324 = 2209^2 + 3982^2 .

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 20736005 - 2⁸ = 20735749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121892 + ... + 122061.

It is an arithmetic number, because the mean of its divisors is an integer number (3293379).

Almost surely, 2^20736005 is an apocalyptic number.

It is an amenable number.

20736005 is a deficient number, since it is larger than the sum of its proper divisors (5611027).

20736005 is a wasteful number, since it uses less digits than its factorization.

20736005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243975.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 20736005 is about 4553.6803796490. The cubic root of 20736005 is about 274.7314402945.

Adding to 20736005 its reverse (50063702), we get a palindrome (70799707).

The spelling of 20736005 in words is "twenty million, seven hundred thirty-six thousand, five".