20418205 has 16 divisors (see below), whose sum is σ = 25369344. Its totient is φ = 15765120.

The previous prime is 20418199. The next prime is 20418239. The reversal of 20418205 is 50281402.

It is not a de Polignac number, because 20418205 - 2¹⁵ = 20385437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20632 + ... + 21598.

It is an arithmetic number, because the mean of its divisors is an integer number (1585584).

Almost surely, 2^20418205 is an apocalyptic number.

It is an amenable number.

20418205 is a deficient number, since it is larger than the sum of its proper divisors (4951139).

20418205 is a wasteful number, since it uses less digits than its factorization.

20418205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20418205 is about 4518.6507942084. The cubic root of 20418205 is about 273.3206972478.

Adding to 20418205 its reverse (50281402), we get a palindrome (70699607).

The spelling of 20418205 in words is "twenty million, four hundred eighteen thousand, two hundred five".