20871888 has 20 divisors (see below), whose sum is σ = 53919168. Its totient is φ = 6957280.

The previous prime is 20871887. The next prime is 20871889. The reversal of 20871888 is 88817802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20871887) and next prime (20871889).

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 3 ways as a sum of consecutive naturals, for example, 217368 + ... + 217463.

Almost surely, 2^20871888 is an apocalyptic number.

It is an amenable number.

20871888 is an abundant number, since it is smaller than the sum of its proper divisors (33047280).

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

20871888 is a wasteful number, since it uses less digits than its factorization.

20871888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434842 (or 434836 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 20871888 is about 4568.5761458030. The cubic root of 20871888 is about 275.3302390799.

The spelling of 20871888 in words is "twenty million, eight hundred seventy-one thousand, eight hundred eighty-eight".