20163705 has 32 divisors (see below), whose sum is σ = 33882624. Its totient is φ = 10227456.

The previous prime is 20163701. The next prime is 20163707. The reversal of 20163705 is 50736102.

It is not a de Polignac number, because 20163705 - 2² = 20163701 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20163701) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25699 + ... + 26471.

It is an arithmetic number, because the mean of its divisors is an integer number (1058832).

Almost surely, 2^20163705 is an apocalyptic number.

It is an amenable number.

20163705 is a deficient number, since it is larger than the sum of its proper divisors (13718919).

20163705 is a wasteful number, since it uses less digits than its factorization.

20163705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 20163705 is about 4490.4014297165. The cubic root of 20163705 is about 272.1803563426.

Adding to 20163705 its reverse (50736102), we get a palindrome (70899807).

The spelling of 20163705 in words is "twenty million, one hundred sixty-three thousand, seven hundred five".