20986271 has 8 divisors (see below), whose sum is σ = 21369600. Its totient is φ = 20606040.

The previous prime is 20986253. The next prime is 20986283. The reversal of 20986271 is 17268902.

It is a happy number.

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 20986271 - 2¹⁴ = 20969887 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 (20986171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16040 + ... + 17298.

It is an arithmetic number, because the mean of its divisors is an integer number (2671200).

Almost surely, 2^20986271 is an apocalyptic number.

20986271 is a deficient number, since it is larger than the sum of its proper divisors (383329).

20986271 is a wasteful number, since it uses less digits than its factorization.

20986271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 20986271 is about 4581.0774933415. The cubic root of 20986271 is about 275.8322818806.

The spelling of 20986271 in words is "twenty million, nine hundred eighty-six thousand, two hundred seventy-one".