19980271 has 4 divisors (see below), whose sum is σ = 20278552. Its totient is φ = 19681992.

The previous prime is 19980241. The next prime is 19980281. The reversal of 19980271 is 17208991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17208991 = 23 ⋅748217.

It is a cyclic number.

It is not a de Polignac number, because 19980271 - 2⁷ = 19980143 is a prime.

It is a super-2 number, since 2×19980271² = 798422458466882, which contains 22 as substring.

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 19980271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19980211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149040 + ... + 149173.

It is an arithmetic number, because the mean of its divisors is an integer number (5069638).

Almost surely, 2^19980271 is an apocalyptic number.

19980271 is a deficient number, since it is larger than the sum of its proper divisors (298281).

19980271 is an equidigital number, since it uses as much as digits as its factorization.

19980271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298280.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 19980271 is about 4469.9296415044. The cubic root of 19980271 is about 271.3524777197.

The spelling of 19980271 in words is "nineteen million, nine hundred eighty thousand, two hundred seventy-one".