20105218 has 8 divisors (see below), whose sum is σ = 34466112. Its totient is φ = 8616516.

The previous prime is 20105201. The next prime is 20105221. The reversal of 20105218 is 81250102.

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

It is a junction number, because it is equal to n+sod(n) for n = 20105195 and 20105204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718030 + ... + 718057.

It is an arithmetic number, because the mean of its divisors is an integer number (4308264).

Almost surely, 2^20105218 is an apocalyptic number.

20105218 is a deficient number, since it is larger than the sum of its proper divisors (14360894).

20105218 is a wasteful number, since it uses less digits than its factorization.

20105218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436096.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 20105218 is about 4483.8842536355. The cubic root of 20105218 is about 271.9169386662.

The spelling of 20105218 in words is "twenty million, one hundred five thousand, two hundred eighteen".