19800017 has 4 divisors (see below), whose sum is σ = 19854336. Its totient is φ = 19745700.

The previous prime is 19799993. The next prime is 19800083. The reversal of 19800017 is 71000891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19800017 - 2¹⁴ = 19783633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19800317) 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, 26609 + ... + 27342.

It is an arithmetic number, because the mean of its divisors is an integer number (4963584).

Almost surely, 2^19800017 is an apocalyptic number.

It is an amenable number.

19800017 is a deficient number, since it is larger than the sum of its proper divisors (54319).

19800017 is an equidigital number, since it uses as much as digits as its factorization.

19800017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54318.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 19800017 is about 4449.7210024899. The cubic root of 19800017 is about 270.5340003250.

The spelling of 19800017 in words is "nineteen million, eight hundred thousand, seventeen".