20671309659 has 32 divisors (see below), whose sum is σ = 37005986304. Its totient is φ = 9912314880.

The previous prime is 20671309643. The next prime is 20671309693. The reversal of 20671309659 is 95690317602.

It is not a de Polignac number, because 20671309659 - 2⁴ = 20671309643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20671309159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3438774 + ... + 3444779.

It is an arithmetic number, because the mean of its divisors is an integer number (1156437072).

Almost surely, 2^20671309659 is an apocalyptic number.

20671309659 is a deficient number, since it is larger than the sum of its proper divisors (16334676645).

20671309659 is a wasteful number, since it uses less digits than its factorization.

20671309659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6883587.

The product of its (nonzero) digits is 612360, while the sum is 48.

The spelling of 20671309659 in words is "twenty billion, six hundred seventy-one million, three hundred nine thousand, six hundred fifty-nine".