20983427409 has 8 divisors (see below), whose sum is σ = 31974746560. Its totient is φ = 11990529936.

The previous prime is 20983427389. The next prime is 20983427411. The reversal of 20983427409 is 90472438902.

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

It is not a de Polignac number, because 20983427409 - 2¹¹ = 20983425361 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 (20983427209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499605394 + ... + 499605435.

It is an arithmetic number, because the mean of its divisors is an integer number (3996843320).

Almost surely, 2^20983427409 is an apocalyptic number.

It is an amenable number.

20983427409 is a deficient number, since it is larger than the sum of its proper divisors (10991319151).

20983427409 is an equidigital number, since it uses as much as digits as its factorization.

20983427409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999210839.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 20983427409 in words is "twenty billion, nine hundred eighty-three million, four hundred twenty-seven thousand, four hundred nine".