20871006 has 32 divisors (see below), whose sum is σ = 47322240. Its totient is φ = 6083424.

The previous prime is 20871001. The next prime is 20871007. The reversal of 20871006 is 60017802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20871001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5560 + ... + 8523.

It is an arithmetic number, because the mean of its divisors is an integer number (1478820).

Almost surely, 2^20871006 is an apocalyptic number.

20871006 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20871006 is an abundant number, since it is smaller than the sum of its proper divisors (26451234).

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

20871006 is a wasteful number, since it uses less digits than its factorization.

20871006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14120.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 20871006 is about 4568.4796158022. The cubic root of 20871006 is about 275.3263607422.

Adding to 20871006 its reverse (60017802), we get a palindrome (80888808).

The spelling of 20871006 in words is "twenty million, eight hundred seventy-one thousand, six".