20090846609 has 4 divisors (see below), whose sum is σ = 20580867300. Its totient is φ = 19600825920.

The previous prime is 20090846603. The next prime is 20090846651. The reversal of 20090846609 is 90664809002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4134104209 + 15956742400 = 64297^2 + 126320^2 .

It is a cyclic number.

It is not a de Polignac number, because 20090846609 - 2⁴ = 20090846593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20090846609.

It is not an unprimeable number, because it can be changed into a prime (20090846603) 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, 245010284 + ... + 245010365.

It is an arithmetic number, because the mean of its divisors is an integer number (5145216825).

Almost surely, 2^20090846609 is an apocalyptic number.

It is an amenable number.

20090846609 is a deficient number, since it is larger than the sum of its proper divisors (490020691).

20090846609 is an equidigital number, since it uses as much as digits as its factorization.

20090846609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490020690.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 20090846609 in words is "twenty billion, ninety million, eight hundred forty-six thousand, six hundred nine".