20871960 has 32 divisors (see below), whose sum is σ = 62616240. Its totient is φ = 5565824.

The previous prime is 20871923. The next prime is 20871973. The reversal of 20871960 is 6917802.

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, 86847 + ... + 87086.

Almost surely, 2^20871960 is an apocalyptic number.

20871960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20871960 is an abundant number, since it is smaller than the sum of its proper divisors (41744280).

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

20871960 is a wasteful number, since it uses less digits than its factorization.

20871960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173947 (or 173943 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 20871960 is about 4568.5840257130. The cubic root of 20871960 is about 275.3305556741.

The spelling of 20871960 in words is "twenty million, eight hundred seventy-one thousand, nine hundred sixty".