20441205409 has 4 divisors (see below), whose sum is σ = 20464356016. Its totient is φ = 20418054804.

The previous prime is 20441205397. The next prime is 20441205427. The reversal of 20441205409 is 90450214402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90450214402 = 2 ⋅45225107201.

It is a cyclic number.

It is not a de Polignac number, because 20441205409 - 2¹¹ = 20441203361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20441205439) 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, 11573979 + ... + 11575744.

It is an arithmetic number, because the mean of its divisors is an integer number (5116089004).

Almost surely, 2^20441205409 is an apocalyptic number.

It is an amenable number.

20441205409 is a deficient number, since it is larger than the sum of its proper divisors (23150607).

20441205409 is an equidigital number, since it uses as much as digits as its factorization.

20441205409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23150606.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 20441205409 in words is "twenty billion, four hundred forty-one million, two hundred five thousand, four hundred nine".