20871886 has 16 divisors (see below), whose sum is σ = 37885536. Its totient is φ = 8418816.

The previous prime is 20871883. The next prime is 20871887. The reversal of 20871886 is 68817802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871881) 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, 43611 + ... + 44086.

It is an arithmetic number, because the mean of its divisors is an integer number (2367846).

Almost surely, 2^20871886 is an apocalyptic number.

20871886 is a deficient number, since it is larger than the sum of its proper divisors (17013650).

20871886 is a wasteful number, since it uses less digits than its factorization.

20871886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87723.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 20871886 is about 4568.5759269164. The cubic root of 20871886 is about 275.3302302856.

The spelling of 20871886 in words is "twenty million, eight hundred seventy-one thousand, eight hundred eighty-six".