19818105 has 16 divisors (see below), whose sum is σ = 31764480. Its totient is φ = 10551168.

The previous prime is 19818103. The next prime is 19818137. The reversal of 19818105 is 50181891.

It is not a de Polignac number, because 19818105 - 2¹ = 19818103 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19818101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14856 + ... + 16134.

It is an arithmetic number, because the mean of its divisors is an integer number (1985280).

Almost surely, 2^19818105 is an apocalyptic number.

19818105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19818105 is a deficient number, since it is larger than the sum of its proper divisors (11946375).

19818105 is a wasteful number, since it uses less digits than its factorization.

19818105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320.

The product of its (nonzero) digits is 2880, while the sum is 33.

The square root of 19818105 is about 4451.7530254946. The cubic root of 19818105 is about 270.6163559724.

Adding to 19818105 its reverse (50181891), we get a palindrome (69999996).

The spelling of 19818105 in words is "nineteen million, eight hundred eighteen thousand, one hundred five".