20850239609 has 8 divisors (see below), whose sum is σ = 20936647368. Its totient is φ = 20763873280.

The previous prime is 20850239587. The next prime is 20850239651. The reversal of 20850239609 is 90693205802.

It can be written as a sum of positive squares in 4 ways, for example, as 2157881209 + 18692358400 = 46453^2 + 136720^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20850239609 - 2²⁸ = 20581804153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20850239609.

It is not an unprimeable number, because it can be changed into a prime (20850239309) 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, 1375379 + ... + 1390455.

It is an arithmetic number, because the mean of its divisors is an integer number (2617080921).

Almost surely, 2^20850239609 is an apocalyptic number.

It is an amenable number.

20850239609 is a deficient number, since it is larger than the sum of its proper divisors (86407759).

20850239609 is a wasteful number, since it uses less digits than its factorization.

20850239609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20715.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 20850239609 in words is "twenty billion, eight hundred fifty million, two hundred thirty-nine thousand, six hundred nine".