20405005 has 8 divisors (see below), whose sum is σ = 25055712. Its totient is φ = 15944208.

The previous prime is 20404999. The next prime is 20405027. The reversal of 20405005 is 50050402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20405005 - 2³ = 20404997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20405005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47239 + ... + 47668.

It is an arithmetic number, because the mean of its divisors is an integer number (3131964).

Almost surely, 2^20405005 is an apocalyptic number.

It is an amenable number.

20405005 is a deficient number, since it is larger than the sum of its proper divisors (4650707).

20405005 is an equidigital number, since it uses as much as digits as its factorization.

20405005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94955.

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

The square root of 20405005 is about 4517.1899450875. The cubic root of 20405005 is about 273.2617855895.

Adding to 20405005 its reverse (50050402), we get a palindrome (70455407).

The spelling of 20405005 in words is "twenty million, four hundred five thousand, five".