20727871 has 8 divisors (see below), whose sum is σ = 21452288. Its totient is φ = 20007000.

The previous prime is 20727851. The next prime is 20727877. The reversal of 20727871 is 17872702.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20727871 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 (20727877) 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 7 ways as a sum of consecutive naturals, for example, 17116 + ... + 18286.

It is an arithmetic number, because the mean of its divisors is an integer number (2681536).

Almost surely, 2^20727871 is an apocalyptic number.

20727871 is a deficient number, since it is larger than the sum of its proper divisors (724417).

20727871 is a wasteful number, since it uses less digits than its factorization.

20727871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 20727871 is about 4552.7871683179. The cubic root of 20727871 is about 274.6955131267.

The spelling of 20727871 in words is "twenty million, seven hundred twenty-seven thousand, eight hundred seventy-one".