20717929682 has 18 divisors (see below), whose sum is σ = 33017994597. Its totient is φ = 9747985504.

The previous prime is 20717929577. The next prime is 20717929697. The reversal of 20717929682 is 28692971702.

It can be written as a sum of positive squares in 2 ways, for example, as 18961565401 + 1756364281 = 137701^2 + 41909^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101779.

It is a super-2 number, since 2×20717929682² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3457493 + ... + 3463479.

Almost surely, 2^20717929682 is an apocalyptic number.

20717929682 is a deficient number, since it is larger than the sum of its proper divisors (12300064915).

20717929682 is an frugal number, since it uses more digits than its factorization.

20717929682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12010 (or 6006 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 20717929682 in words is "twenty billion, seven hundred seventeen million, nine hundred twenty-nine thousand, six hundred eighty-two".