20200105 has 4 divisors (see below), whose sum is σ = 24240132. Its totient is φ = 16160080.

The previous prime is 20200099. The next prime is 20200109. The reversal of 20200105 is 50100202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50100202 = 2 ⋅25050101.

It can be written as a sum of positive squares in 2 ways, for example, as 9467929 + 10732176 = 3077^2 + 3276^2 .

It is a de Polignac number, because none of the positive numbers 2^k-20200105 is a prime.

It is a super-2 number, since 2×20200105² = 816088484022050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20200091 and 20200100.

It is not an unprimeable number, because it can be changed into a prime (20200109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2020006 + ... + 2020015.

It is an arithmetic number, because the mean of its divisors is an integer number (6060033).

Almost surely, 2^20200105 is an apocalyptic number.

It is an amenable number.

20200105 is a deficient number, since it is larger than the sum of its proper divisors (4040027).

20200105 is an equidigital number, since it uses as much as digits as its factorization.

20200105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4040026.

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

The square root of 20200105 is about 4494.4526919304. The cubic root of 20200105 is about 272.3440400385.

Adding to 20200105 its reverse (50100202), we get a palindrome (70300307).

The spelling of 20200105 in words is "twenty million, two hundred thousand, one hundred five".