20740217 has 2 divisors, whose sum is σ = 20740218. Its totient is φ = 20740216.

The previous prime is 20740201. The next prime is 20740241. The reversal of 20740217 is 71204702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11806096 + 8934121 = 3436^2 + 2989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20740217 - 2⁴ = 20740201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20740192 and 20740201.

It is not a weakly prime, because it can be changed into another prime (20740297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370108 + 10370109.

It is an arithmetic number, because the mean of its divisors is an integer number (10370109).

Almost surely, 2^20740217 is an apocalyptic number.

It is an amenable number.

20740217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740217 is an equidigital number, since it uses as much as digits as its factorization.

20740217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 20740217 is about 4554.1428392179. The cubic root of 20740217 is about 274.7500406386.

Adding to 20740217 its reverse (71204702), we get a palindrome (91944919).

The spelling of 20740217 in words is "twenty million, seven hundred forty thousand, two hundred seventeen".