20210005 has 4 divisors (see below), whose sum is σ = 24252012. Its totient is φ = 16168000.

The previous prime is 20209993. The next prime is 20210023. The reversal of 20210005 is 50001202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12773476 + 7436529 = 3574^2 + 2727^2 .

It is not a de Polignac number, because 20210005 - 2⁹ = 20209493 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20209973 and 20210000.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 2020996 + ... + 2021005.

It is an arithmetic number, because the mean of its divisors is an integer number (6063003).

Almost surely, 2^20210005 is an apocalyptic number.

It is an amenable number.

20210005 is a deficient number, since it is larger than the sum of its proper divisors (4042007).

20210005 is an equidigital number, since it uses as much as digits as its factorization.

20210005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4042006.

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

The square root of 20210005 is about 4495.5539147028. The cubic root of 20210005 is about 272.3885243889.

Adding to 20210005 its reverse (50001202), we get a palindrome (70211207).

The spelling of 20210005 in words is "twenty million, two hundred ten thousand, five".