19980817 has 8 divisors (see below), whose sum is σ = 20547072. Its totient is φ = 19418400.

The previous prime is 19980811. The next prime is 19980823. The reversal of 19980817 is 71808991.

It is an interprime number because it is at equal distance from previous prime (19980811) and next prime (19980823).

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 19980817 - 2³ = 19980809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19980811) 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, 11968 + ... + 13534.

It is an arithmetic number, because the mean of its divisors is an integer number (2568384).

Almost surely, 2^19980817 is an apocalyptic number.

It is an amenable number.

19980817 is a deficient number, since it is larger than the sum of its proper divisors (566255).

19980817 is a wasteful number, since it uses less digits than its factorization.

19980817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 19980817 is about 4469.9907158740. The cubic root of 19980817 is about 271.3549494430.

The spelling of 19980817 in words is "nineteen million, nine hundred eighty thousand, eight hundred seventeen".