20217238179 has 8 divisors (see below), whose sum is σ = 26961185472. Its totient is φ = 13475724840.

The previous prime is 20217238109. The next prime is 20217238183. The reversal of 20217238179 is 97183271202.

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

It is not a de Polignac number, because 20217238179 - 2¹² = 20217234083 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20217238179.

It is not an unprimeable number, because it can be changed into a prime (20217238109) 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, 589017 + ... + 622394.

It is an arithmetic number, because the mean of its divisors is an integer number (3370148184).

Almost surely, 2^20217238179 is an apocalyptic number.

20217238179 is a deficient number, since it is larger than the sum of its proper divisors (6743947293).

20217238179 is a wasteful number, since it uses less digits than its factorization.

20217238179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216977.

The product of its (nonzero) digits is 84672, while the sum is 42.

The spelling of 20217238179 in words is "twenty billion, two hundred seventeen million, two hundred thirty-eight thousand, one hundred seventy-nine".