20471104689 has 32 divisors (see below), whose sum is σ = 31391813376. Its totient is φ = 11623772160.

The previous prime is 20471104679. The next prime is 20471104691. The reversal of 20471104689 is 98640117402.

It is a de Polignac number, because none of the positive numbers 2^k-20471104689 is a prime.

It is a super-2 number, since 2×20471104689² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20471104689.

It is not an unprimeable number, because it can be changed into a prime (20471104679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3873729 + ... + 3879009.

It is an arithmetic number, because the mean of its divisors is an integer number (980994168).

Almost surely, 2^20471104689 is an apocalyptic number.

It is an amenable number.

20471104689 is a deficient number, since it is larger than the sum of its proper divisors (10920708687).

20471104689 is a wasteful number, since it uses less digits than its factorization.

20471104689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6425.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 20471104689 in words is "twenty billion, four hundred seventy-one million, one hundred four thousand, six hundred eighty-nine".