20784254717 has 8 divisors (see below), whose sum is σ = 21882394560. Its totient is φ = 19686538080.

The previous prime is 20784254669. The next prime is 20784254741. The reversal of 20784254717 is 71745248702.

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 20784254717 - 2¹⁴ = 20784238333 is a prime.

It is a super-2 number, since 2×20784254717² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20784254917) 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, 2384 + ... + 203897.

It is an arithmetic number, because the mean of its divisors is an integer number (2735299320).

Almost surely, 2^20784254717 is an apocalyptic number.

It is an amenable number.

20784254717 is a deficient number, since it is larger than the sum of its proper divisors (1098139843).

20784254717 is a wasteful number, since it uses less digits than its factorization.

20784254717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211603.

The product of its (nonzero) digits is 878080, while the sum is 47.

The spelling of 20784254717 in words is "twenty billion, seven hundred eighty-four million, two hundred fifty-four thousand, seven hundred seventeen".