20180219 has 4 divisors (see below), whose sum is σ = 20213544. Its totient is φ = 20146896.

The previous prime is 20180213. The next prime is 20180221. The reversal of 20180219 is 91208102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91208102 = 2 ⋅45604051.

It is a cyclic number.

It is not a de Polignac number, because 20180219 - 2²⁰ = 19131643 is a prime.

It is a super-2 number, since 2×20180219² = 814482477775922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20180194 and 20180203.

It is not an unprimeable number, because it can be changed into a prime (20180213) 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, 15737 + ... + 16970.

It is an arithmetic number, because the mean of its divisors is an integer number (5053386).

Almost surely, 2^20180219 is an apocalyptic number.

20180219 is a deficient number, since it is larger than the sum of its proper divisors (33325).

20180219 is an equidigital number, since it uses as much as digits as its factorization.

20180219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33324.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 20180219 is about 4492.2398644774. The cubic root of 20180219 is about 272.2546409692.

The spelling of 20180219 in words is "twenty million, one hundred eighty thousand, two hundred nineteen".