20107217 has 4 divisors (see below), whose sum is σ = 21653940. Its totient is φ = 18560496.

The previous prime is 20107207. The next prime is 20107223. The reversal of 20107217 is 71270102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2876416 + 17230801 = 1696^2 + 4151^2 .

It is a cyclic number.

It is not a de Polignac number, because 20107217 - 2¹⁸ = 19845073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20107207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773342 + ... + 773367.

It is an arithmetic number, because the mean of its divisors is an integer number (5413485).

Almost surely, 2^20107217 is an apocalyptic number.

It is an amenable number.

20107217 is a deficient number, since it is larger than the sum of its proper divisors (1546723).

20107217 is a wasteful number, since it uses less digits than its factorization.

20107217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546722.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 20107217 is about 4484.1071575064. The cubic root of 20107217 is about 271.9259503225.

Adding to 20107217 its reverse (71270102), we get a palindrome (91377319).

The spelling of 20107217 in words is "twenty million, one hundred seven thousand, two hundred seventeen".