20206444409 has 8 divisors (see below), whose sum is σ = 21397706568. Its totient is φ = 19015476480.

The previous prime is 20206444393. The next prime is 20206444483. The reversal of 20206444409 is 90444460202.

It can be written as a sum of positive squares in 4 ways, for example, as 76510009 + 20129934400 = 8747^2 + 141880^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20206444409 - 2⁴ = 20206444393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20206444499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76619 + ... + 215135.

It is an arithmetic number, because the mean of its divisors is an integer number (2674713321).

Almost surely, 2^20206444409 is an apocalyptic number.

It is an amenable number.

20206444409 is a deficient number, since it is larger than the sum of its proper divisors (1191262159).

20206444409 is a wasteful number, since it uses less digits than its factorization.

20206444409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147115.

The product of its (nonzero) digits is 55296, while the sum is 35.

The spelling of 20206444409 in words is "twenty billion, two hundred six million, four hundred forty-four thousand, four hundred nine".