20717173409 has 8 divisors (see below), whose sum is σ = 20752007232. Its totient is φ = 20682370800.

The previous prime is 20717173397. The next prime is 20717173441. The reversal of 20717173409 is 90437171702.

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 20717173409 - 2⁸ = 20717173153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20717179409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1579412 + ... + 1592474.

It is an arithmetic number, because the mean of its divisors is an integer number (2594000904).

Almost surely, 2^20717173409 is an apocalyptic number.

It is an amenable number.

20717173409 is a deficient number, since it is larger than the sum of its proper divisors (34833823).

20717173409 is a wasteful number, since it uses less digits than its factorization.

20717173409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15607.

The product of its (nonzero) digits is 74088, while the sum is 41.

The spelling of 20717173409 in words is "twenty billion, seven hundred seventeen million, one hundred seventy-three thousand, four hundred nine".