20104443409 has 2 divisors, whose sum is σ = 20104443410. Its totient is φ = 20104443408.

The previous prime is 20104443397. The next prime is 20104443431. The reversal of 20104443409 is 90434440102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11741889600 + 8362553809 = 108360^2 + 91447^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104443409 - 2⁵ = 20104443377 is a prime.

It is not a weakly prime, because it can be changed into another prime (20108443409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052221704 + 10052221705.

It is an arithmetic number, because the mean of its divisors is an integer number (10052221705).

Almost surely, 2^20104443409 is an apocalyptic number.

It is an amenable number.

20104443409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20104443409 is an equidigital number, since it uses as much as digits as its factorization.

20104443409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 20104443409 in words is "twenty billion, one hundred four million, four hundred forty-three thousand, four hundred nine".