20441205405 has 12 divisors (see below), whose sum is σ = 35431422780. Its totient is φ = 10901976192.

The previous prime is 20441205397. The next prime is 20441205427. The reversal of 20441205405 is 50450214402.

20441205405 is a `hidden beast` number, since 204 + 412 + 0 + 5 + 40 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11585077956 + 8856127449 = 107634^2 + 94107^2 .

It is not a de Polignac number, because 20441205405 - 2³ = 20441205397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 227124460 + ... + 227124549.

It is an arithmetic number, because the mean of its divisors is an integer number (2952618565).

Almost surely, 2^20441205405 is an apocalyptic number.

It is an amenable number.

20441205405 is a deficient number, since it is larger than the sum of its proper divisors (14990217375).

20441205405 is a wasteful number, since it uses less digits than its factorization.

20441205405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454249020 (or 454249017 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 20441205405 its reverse (50450214402), we get a palindrome (70891419807).

The spelling of 20441205405 in words is "twenty billion, four hundred forty-one million, two hundred five thousand, four hundred five".