20871263 has 8 divisors (see below), whose sum is σ = 24140928. Its totient is φ = 17673624.

The previous prime is 20871251. The next prime is 20871283. The reversal of 20871263 is 36217802.

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 20871263 - 2⁸ = 20871007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871283) 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, 17381 + ... + 18542.

It is an arithmetic number, because the mean of its divisors is an integer number (3017616).

Almost surely, 2^20871263 is an apocalyptic number.

20871263 is a deficient number, since it is larger than the sum of its proper divisors (3269665).

20871263 is an equidigital number, since it uses as much as digits as its factorization.

20871263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36013.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20871263 is about 4568.5077432352. The cubic root of 20871263 is about 275.3274908360.

The spelling of 20871263 in words is "twenty million, eight hundred seventy-one thousand, two hundred sixty-three".