20871313 has 8 divisors (see below), whose sum is σ = 21241440. Its totient is φ = 20504640.

The previous prime is 20871311. The next prime is 20871341. The reversal of 20871313 is 31317802.

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 20871313 - 2¹ = 20871311 is a prime.

It is a super-2 number, since 2×20871313² = 871223412687938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20871311) 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, 13273 + ... + 14761.

It is an arithmetic number, because the mean of its divisors is an integer number (2655180).

Almost surely, 2^20871313 is an apocalyptic number.

It is an amenable number.

20871313 is a deficient number, since it is larger than the sum of its proper divisors (370127).

20871313 is a wasteful number, since it uses less digits than its factorization.

20871313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20871313 is about 4568.5132154783. The cubic root of 20871313 is about 275.3277106976.

The spelling of 20871313 in words is "twenty million, eight hundred seventy-one thousand, three hundred thirteen".