20712017 has 8 divisors (see below), whose sum is σ = 20993280. Its totient is φ = 20432880.

The previous prime is 20711987. The next prime is 20712019. The reversal of 20712017 is 71021702.

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 20712017 - 2¹⁸ = 20449873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20712017.

It is not an unprimeable number, because it can be changed into a prime (20712019) 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, 28859 + ... + 29567.

It is an arithmetic number, because the mean of its divisors is an integer number (2624160).

Almost surely, 2^20712017 is an apocalyptic number.

It is an amenable number.

20712017 is a deficient number, since it is larger than the sum of its proper divisors (281263).

20712017 is a wasteful number, since it uses less digits than its factorization.

20712017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063.

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

The square root of 20712017 is about 4551.0457040113. The cubic root of 20712017 is about 274.6254603707.

Adding to 20712017 its reverse (71021702), we get a palindrome (91733719).

The spelling of 20712017 in words is "twenty million, seven hundred twelve thousand, seventeen".