20871210 has 32 divisors (see below), whose sum is σ = 50274432. Its totient is φ = 5545280.

The previous prime is 20871209. The next prime is 20871217. The reversal of 20871210 is 1217802.

It is not an unprimeable number, because it can be changed into a prime (20871217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8212 + ... + 10448.

It is an arithmetic number, because the mean of its divisors is an integer number (1571076).

Almost surely, 2^20871210 is an apocalyptic number.

20871210 is an abundant number, since it is smaller than the sum of its proper divisors (29403222).

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

20871210 is a wasteful number, since it uses less digits than its factorization.

20871210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2558.

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 20871210 is about 4568.5019426503. The cubic root of 20871210 is about 275.3272577824.

The spelling of 20871210 in words is "twenty million, eight hundred seventy-one thousand, two hundred ten".