20689401705 has 128 divisors (see below), whose sum is σ = 40697856000. Its totient is φ = 8772019200.

The previous prime is 20689401683. The next prime is 20689401709. The reversal of 20689401705 is 50710498602.

It is not a de Polignac number, because 20689401705 - 2⁸ = 20689401449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20689401709) 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 127 ways as a sum of consecutive naturals, for example, 14064120 + ... + 14065590.

It is an arithmetic number, because the mean of its divisors is an integer number (317952000).

Almost surely, 2^20689401705 is an apocalyptic number.

It is an amenable number.

20689401705 is a deficient number, since it is larger than the sum of its proper divisors (20008454295).

20689401705 is a wasteful number, since it uses less digits than its factorization.

20689401705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 20689401705 in words is "twenty billion, six hundred eighty-nine million, four hundred one thousand, seven hundred five".