20909446579 has 8 divisors (see below), whose sum is σ = 24935489280. Its totient is φ = 17143148616.

The previous prime is 20909446573. The next prime is 20909446637. The reversal of 20909446579 is 97564490902.

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 20909446579 - 2⁷ = 20909446451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20909446573) 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, 64936009 + ... + 64936330.

It is an arithmetic number, because the mean of its divisors is an integer number (3116936160).

Almost surely, 2^20909446579 is an apocalyptic number.

20909446579 is a deficient number, since it is larger than the sum of its proper divisors (4026042701).

20909446579 is a wasteful number, since it uses less digits than its factorization.

20909446579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129872369.

The product of its (nonzero) digits is 4898880, while the sum is 55.

The spelling of 20909446579 in words is "twenty billion, nine hundred nine million, four hundred forty-six thousand, five hundred seventy-nine".