20041005409 has 2 divisors, whose sum is σ = 20041005410. Its totient is φ = 20041005408.

The previous prime is 20041005371. The next prime is 20041005419. The reversal of 20041005409 is 90450014002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17723064384 + 2317941025 = 133128^2 + 48145^2 .

It is a cyclic number.

It is not a de Polignac number, because 20041005409 - 2¹⁹ = 20040481121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20041005419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10020502704 + 10020502705.

It is an arithmetic number, because the mean of its divisors is an integer number (10020502705).

Almost surely, 2^20041005409 is an apocalyptic number.

It is an amenable number.

20041005409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20041005409 is an equidigital number, since it uses as much as digits as its factorization.

20041005409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 25.

The spelling of 20041005409 in words is "twenty billion, forty-one million, five thousand, four hundred nine".