20345105 has 16 divisors (see below), whose sum is σ = 28036800. Its totient is φ = 14016960.

The previous prime is 20345093. The next prime is 20345161. The reversal of 20345105 is 50154302.

It is not a de Polignac number, because 20345105 - 2¹⁶ = 20279569 is a prime.

It is a super-2 number, since 2×20345105² = 827846594922050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 8690 + ... + 10779.

It is an arithmetic number, because the mean of its divisors is an integer number (1752300).

Almost surely, 2^20345105 is an apocalyptic number.

It is an amenable number.

20345105 is a deficient number, since it is larger than the sum of its proper divisors (7691695).

20345105 is a wasteful number, since it uses less digits than its factorization.

20345105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19504.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20345105 is about 4510.5548439189. The cubic root of 20345105 is about 272.9941319120.

Adding to 20345105 its reverse (50154302), we get a palindrome (70499407).

The spelling of 20345105 in words is "twenty million, three hundred forty-five thousand, one hundred five".