20446006409 has 2 divisors, whose sum is σ = 20446006410. Its totient is φ = 20446006408.

The previous prime is 20446006393. The next prime is 20446006421. The reversal of 20446006409 is 90460064402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19306268809 + 1139737600 = 138947^2 + 33760^2 .

It is a cyclic number.

It is not a de Polignac number, because 20446006409 - 2⁴ = 20446006393 is a prime.

It is not a weakly prime, because it can be changed into another prime (20446006429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223003204 + 10223003205.

It is an arithmetic number, because the mean of its divisors is an integer number (10223003205).

Almost surely, 2^20446006409 is an apocalyptic number.

It is an amenable number.

20446006409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20446006409 is an equidigital number, since it uses as much as digits as its factorization.

20446006409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 35.

The spelling of 20446006409 in words is "twenty billion, four hundred forty-six million, six thousand, four hundred nine".