20871894 has 16 divisors (see below), whose sum is σ = 42011568. Its totient is φ = 6912672.

The previous prime is 20871889. The next prime is 20871923. The reversal of 20871894 is 49817802.

20871894 is nontrivially palindromic in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10137 + ... + 12020.

It is an arithmetic number, because the mean of its divisors is an integer number (2625723).

Almost surely, 2^20871894 is an apocalyptic number.

20871894 is an abundant number, since it is smaller than the sum of its proper divisors (21139674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20871894 is a wasteful number, since it uses less digits than its factorization.

20871894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22319.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20871894 is about 4568.5768024627. The cubic root of 20871894 is about 275.3302654628.

The spelling of 20871894 in words is "twenty million, eight hundred seventy-one thousand, eight hundred ninety-four".