20020105 has 16 divisors (see below), whose sum is σ = 27768960. Its totient is φ = 13571712.

The previous prime is 20020103. The next prime is 20020109. The reversal of 20020105 is 50102002.

It is not a de Polignac number, because 20020105 - 2¹ = 20020103 is a prime.

It is a super-2 number, since 2×20020105² = 801609208422050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20020091 and 20020100.

It is not an unprimeable number, because it can be changed into a prime (20020103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99 + ... + 6328.

It is an arithmetic number, because the mean of its divisors is an integer number (1735560).

Almost surely, 2^20020105 is an apocalyptic number.

It is an amenable number.

20020105 is a deficient number, since it is larger than the sum of its proper divisors (7748855).

20020105 is an equidigital number, since it uses as much as digits as its factorization.

20020105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6528.

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 20020105 is about 4474.3831977156. The cubic root of 20020105 is about 271.5326868091.

Adding to 20020105 its reverse (50102002), we get a palindrome (70122107).

The spelling of 20020105 in words is "twenty million, twenty thousand, one hundred five".