19970018 has 8 divisors (see below), whose sum is σ = 30592512. Its totient is φ = 9772516.

The previous prime is 19970011. The next prime is 19970039. The reversal of 19970018 is 81007991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19970018.

It is not an unprimeable number, because it can be changed into a prime (19970011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106130 + ... + 106317.

It is an arithmetic number, because the mean of its divisors is an integer number (3824064).

Almost surely, 2^19970018 is an apocalyptic number.

19970018 is a deficient number, since it is larger than the sum of its proper divisors (10622494).

19970018 is a wasteful number, since it uses less digits than its factorization.

19970018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212496.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 19970018 is about 4468.7826082726. The cubic root of 19970018 is about 271.3060543757.

The spelling of 19970018 in words is "nineteen million, nine hundred seventy thousand, eighteen".