20687586386 has 8 divisors (see below), whose sum is σ = 31032009084. Its totient is φ = 10343583360.

The previous prime is 20687586383. The next prime is 20687586419. The reversal of 20687586386 is 68368578602.

It can be written as a sum of positive squares in 2 ways, for example, as 19847456161 + 840130225 = 140881^2 + 28985^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20687586383) 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 3 ways as a sum of consecutive naturals, for example, 92966 + ... + 223646.

Almost surely, 2^20687586386 is an apocalyptic number.

20687586386 is a deficient number, since it is larger than the sum of its proper divisors (10344422698).

20687586386 is a wasteful number, since it uses less digits than its factorization.

20687586386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209836.

The product of its (nonzero) digits is 23224320, while the sum is 59.

The spelling of 20687586386 in words is "twenty billion, six hundred eighty-seven million, five hundred eighty-six thousand, three hundred eighty-six".