20771263 has 8 divisors (see below), whose sum is σ = 22304160. Its totient is φ = 19272960.

The previous prime is 20771213. The next prime is 20771269. The reversal of 20771263 is 36217702.

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 20771263 - 2²¹ = 18674111 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 (20771269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7398 + ... + 9811.

It is an arithmetic number, because the mean of its divisors is an integer number (2788020).

Almost surely, 2^20771263 is an apocalyptic number.

20771263 is a deficient number, since it is larger than the sum of its proper divisors (1532897).

20771263 is a wasteful number, since it uses less digits than its factorization.

20771263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17297.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 20771263 is about 4557.5501094338. The cubic root of 20771263 is about 274.8870632675.

Adding to 20771263 its reverse (36217702), we get a palindrome (56988965).

The spelling of 20771263 in words is "twenty million, seven hundred seventy-one thousand, two hundred sixty-three".