201720017 has 8 divisors (see below), whose sum is σ = 215328960. Its totient is φ = 188410320.

The previous prime is 201719989. The next prime is 201720047. The reversal of 201720017 is 710027102.

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 201720017 - 2¹⁴ = 201703633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201720047) 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, 73418 + ... + 76115.

It is an arithmetic number, because the mean of its divisors is an integer number (26916120).

Almost surely, 2^201720017 is an apocalyptic number.

It is an amenable number.

201720017 is a deficient number, since it is larger than the sum of its proper divisors (13608943).

201720017 is a wasteful number, since it uses less digits than its factorization.

201720017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149623.

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

The square root of 201720017 is about 14202.8172205376. The cubic root of 201720017 is about 586.4752179988.

Adding to 201720017 its reverse (710027102), we get a palindrome (911747119).

The spelling of 201720017 in words is "two hundred one million, seven hundred twenty thousand, seventeen".