20686452384853 has 4 divisors (see below), whose sum is σ = 20687805428620. Its totient is φ = 20685099341088.

The previous prime is 20686452384791. The next prime is 20686452384869. The reversal of 20686452384853 is 35848325468602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15943713589764 + 4742738795089 = 3992958^2 + 2177783^2 .

It is a cyclic number.

It is not a de Polignac number, because 20686452384853 - 2³⁷ = 20549013431381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20686452384883) 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 3 ways as a sum of consecutive naturals, for example, 676498950 + ... + 676529527.

It is an arithmetic number, because the mean of its divisors is an integer number (5171951357155).

Almost surely, 2^{20686452384853} is an apocalyptic number.

It is an amenable number.

20686452384853 is a deficient number, since it is larger than the sum of its proper divisors (1353043767).

20686452384853 is a wasteful number, since it uses less digits than its factorization.

20686452384853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353043766.

The product of its (nonzero) digits is 265420800, while the sum is 64.

The spelling of 20686452384853 in words is "twenty trillion, six hundred eighty-six billion, four hundred fifty-two million, three hundred eighty-four thousand, eight hundred fifty-three".