20871386 has 8 divisors (see below), whose sum is σ = 32954880. Its totient is φ = 9886428.

The previous prime is 20871379. The next prime is 20871397. The reversal of 20871386 is 68317802.

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

It is a super-2 number, since 2×20871386² = 871229507121992, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274586 + ... + 274661.

It is an arithmetic number, because the mean of its divisors is an integer number (4119360).

Almost surely, 2^20871386 is an apocalyptic number.

20871386 is a deficient number, since it is larger than the sum of its proper divisors (12083494).

20871386 is a wasteful number, since it uses less digits than its factorization.

20871386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549268.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20871386 is about 4568.5212049415. The cubic root of 20871386 is about 275.3280316948.

The spelling of 20871386 in words is "twenty million, eight hundred seventy-one thousand, three hundred eighty-six".