20067217 has 4 divisors (see below), whose sum is σ = 20759220. Its totient is φ = 19375216.

The previous prime is 20067169. The next prime is 20067233. The reversal of 20067217 is 71276002.

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 10182481 + 9884736 = 3191^2 + 3144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20067217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20067191 and 20067200.

It is not an unprimeable number, because it can be changed into a prime (20067317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 345958 + ... + 346015.

It is an arithmetic number, because the mean of its divisors is an integer number (5189805).

Almost surely, 2^20067217 is an apocalyptic number.

It is an amenable number.

20067217 is a deficient number, since it is larger than the sum of its proper divisors (692003).

20067217 is an equidigital number, since it uses as much as digits as its factorization.

20067217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692002.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 20067217 is about 4479.6447403784. The cubic root of 20067217 is about 271.7455133069.

The spelling of 20067217 in words is "twenty million, sixty-seven thousand, two hundred seventeen".