20170218 has 16 divisors (see below), whose sum is σ = 42094656. Its totient is φ = 6431040.

The previous prime is 20170193. The next prime is 20170219. The reversal of 20170218 is 81207102.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20170194 and 20170203.

It is not an unprimeable number, because it can be changed into a prime (20170219) 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, 72943 + ... + 73218.

It is an arithmetic number, because the mean of its divisors is an integer number (2630916).

Almost surely, 2^20170218 is an apocalyptic number.

20170218 is an abundant number, since it is smaller than the sum of its proper divisors (21924438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20170218 is a wasteful number, since it uses less digits than its factorization.

20170218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146189.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20170218 is about 4491.1265847224. The cubic root of 20170218 is about 272.2096584943.

The spelling of 20170218 in words is "twenty million, one hundred seventy thousand, two hundred eighteen".