20105418 has 16 divisors (see below), whose sum is σ = 40265280. Its totient is φ = 6692736.

The previous prime is 20105411. The next prime is 20105419. The reversal of 20105418 is 81450102.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20105394 and 20105403.

It is not an unprimeable number, because it can be changed into a prime (20105411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3771 + ... + 7377.

It is an arithmetic number, because the mean of its divisors is an integer number (2516580).

Almost surely, 2^20105418 is an apocalyptic number.

20105418 is an abundant number, since it is smaller than the sum of its proper divisors (20159862).

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

20105418 is a wasteful number, since it uses less digits than its factorization.

20105418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4541.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20105418 is about 4483.9065556722. The cubic root of 20105418 is about 271.9178403095.

The spelling of 20105418 in words is "twenty million, one hundred five thousand, four hundred eighteen".