20050405 has 4 divisors (see below), whose sum is σ = 24060492. Its totient is φ = 16040320.

The previous prime is 20050403. The next prime is 20050439. The reversal of 20050405 is 50405002.

It is a happy number.

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 4186116 + 15864289 = 2046^2 + 3983^2 .

It is not a de Polignac number, because 20050405 - 2¹ = 20050403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20050403) 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, 2005036 + ... + 2005045.

It is an arithmetic number, because the mean of its divisors is an integer number (6015123).

Almost surely, 2^20050405 is an apocalyptic number.

It is an amenable number.

20050405 is a deficient number, since it is larger than the sum of its proper divisors (4010087).

20050405 is an equidigital number, since it uses as much as digits as its factorization.

20050405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4010086.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20050405 is about 4477.7678591012. The cubic root of 20050405 is about 271.6696040599.

Adding to 20050405 its reverse (50405002), we get a palindrome (70455407).

It can be divided in two parts, 200 and 50405, that added together give a palindrome (50605).

The spelling of 20050405 in words is "twenty million, fifty thousand, four hundred five".