20871449280727 has 4 divisors (see below), whose sum is σ = 22099181591376. Its totient is φ = 19643716970080.

The previous prime is 20871449280691. The next prime is 20871449280757. The reversal of 20871449280727 is 72708294417802.

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

It is a cyclic number.

It is not a de Polignac number, because 20871449280727 - 2¹⁹ = 20871448756439 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 (20871449280757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 613866155299 + ... + 613866155332.

It is an arithmetic number, because the mean of its divisors is an integer number (5524795397844).

Almost surely, 2^{20871449280727} is an apocalyptic number.

20871449280727 is a deficient number, since it is larger than the sum of its proper divisors (1227732310649).

20871449280727 is a wasteful number, since it uses less digits than its factorization.

20871449280727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227732310648.

The product of its (nonzero) digits is 25288704, while the sum is 61.

The spelling of 20871449280727 in words is "twenty trillion, eight hundred seventy-one billion, four hundred forty-nine million, two hundred eighty thousand, seven hundred twenty-seven".