20716191730 has 16 divisors (see below), whose sum is σ = 40157541144. Its totient is φ = 7649055360.

The previous prime is 20716191689. The next prime is 20716191751. The reversal of 20716191730 is 3719161702.

It can be written as a sum of positive squares in 4 ways, for example, as 5330022049 + 15386169681 = 73007^2 + 124041^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20716191730.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79677531 + ... + 79677790.

Almost surely, 2^20716191730 is an apocalyptic number.

20716191730 is a deficient number, since it is larger than the sum of its proper divisors (19441349414).

20716191730 is a wasteful number, since it uses less digits than its factorization.

20716191730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159355341.

The product of its (nonzero) digits is 15876, while the sum is 37.

The spelling of 20716191730 in words is "twenty billion, seven hundred sixteen million, one hundred ninety-one thousand, seven hundred thirty".