20386688705 has 8 divisors (see below), whose sum is σ = 24470080872. Its totient is φ = 16305314688.

The previous prime is 20386688701. The next prime is 20386688759. The reversal of 20386688705 is 50788668302.

It can be written as a sum of positive squares in 4 ways, for example, as 2688111409 + 17698577296 = 51847^2 + 133036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20386688705 - 2² = 20386688701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20386688701) 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 7 ways as a sum of consecutive naturals, for example, 482222 + ... + 522791.

It is an arithmetic number, because the mean of its divisors is an integer number (3058760109).

Almost surely, 2^20386688705 is an apocalyptic number.

It is an amenable number.

20386688705 is a deficient number, since it is larger than the sum of its proper divisors (4083392167).

20386688705 is a wasteful number, since it uses less digits than its factorization.

20386688705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009075.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 20386688705 in words is "twenty billion, three hundred eighty-six million, six hundred eighty-eight thousand, seven hundred five".