20705105 has 8 divisors (see below), whose sum is σ = 24871272. Its totient is φ = 16547328.

The previous prime is 20705081. The next prime is 20705107. The reversal of 20705105 is 50150702.

It can be written as a sum of positive squares in 4 ways, for example, as 929296 + 19775809 = 964^2 + 4447^2 .

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 20705105 - 2¹⁰ = 20704081 is a prime.

It is a super-2 number, since 2×20705105² = 857402746122050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20705107) 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, 6689 + ... + 9281.

It is an arithmetic number, because the mean of its divisors is an integer number (3108909).

Almost surely, 2^20705105 is an apocalyptic number.

It is an amenable number.

20705105 is a deficient number, since it is larger than the sum of its proper divisors (4166167).

20705105 is a wasteful number, since it uses less digits than its factorization.

20705105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20705105 is about 4550.2862547317. The cubic root of 20705105 is about 274.5949076988.

Adding to 20705105 its reverse (50150702), we get a palindrome (70855807).

The spelling of 20705105 in words is "twenty million, seven hundred five thousand, one hundred five".