20408184517 has 8 divisors (see below), whose sum is σ = 23326005312. Its totient is φ = 17490955200.

The previous prime is 20408184481. The next prime is 20408184541. The reversal of 20408184517 is 71548180402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20408184517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20408184517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408184817) 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, 71284 + ... + 214237.

It is an arithmetic number, because the mean of its divisors is an integer number (2915750664).

Almost surely, 2^20408184517 is an apocalyptic number.

It is an amenable number.

20408184517 is a deficient number, since it is larger than the sum of its proper divisors (2917820795).

20408184517 is a wasteful number, since it uses less digits than its factorization.

20408184517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295739.

The product of its (nonzero) digits is 71680, while the sum is 40.

The spelling of 20408184517 in words is "twenty billion, four hundred eight million, one hundred eighty-four thousand, five hundred seventeen".