20617705163 has 16 divisors (see below), whose sum is σ = 23779276800. Its totient is φ = 17679293280.

The previous prime is 20617705109. The next prime is 20617705169. The reversal of 20617705163 is 36150771602.

It is not a de Polignac number, because 20617705163 - 2¹² = 20617701067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20617705169) 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 15 ways as a sum of consecutive naturals, for example, 167531 + ... + 263252.

It is an arithmetic number, because the mean of its divisors is an integer number (1486204800).

Almost surely, 2^20617705163 is an apocalyptic number.

20617705163 is a deficient number, since it is larger than the sum of its proper divisors (3161571637).

20617705163 is a wasteful number, since it uses less digits than its factorization.

20617705163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431042.

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 20617705163 in words is "twenty billion, six hundred seventeen million, seven hundred five thousand, one hundred sixty-three".