20216018 has 8 divisors (see below), whose sum is σ = 30506112. Its totient is φ = 10047316.

The previous prime is 20216017. The next prime is 20216033. The reversal of 20216018 is 81061202.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20216017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29930 + ... + 30597.

It is an arithmetic number, because the mean of its divisors is an integer number (3813264).

Almost surely, 2^20216018 is an apocalyptic number.

20216018 is a deficient number, since it is larger than the sum of its proper divisors (10290094).

20216018 is a wasteful number, since it uses less digits than its factorization.

20216018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60696.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 20216018 is about 4496.2226368364. Note that the first 3 decimals coincide. The cubic root of 20216018 is about 272.4155359242.

The spelling of 20216018 in words is "twenty million, two hundred sixteen thousand, eighteen".