20875812 has 48 divisors (see below), whose sum is σ = 52039680. Its totient is φ = 6497568.

The previous prime is 20875781. The next prime is 20875817. The reversal of 20875812 is 21857802.

It is not an unprimeable number, because it can be changed into a prime (20875817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10989 + ... + 12747.

It is an arithmetic number, because the mean of its divisors is an integer number (1084160).

Almost surely, 2^20875812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20875812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26019840).

20875812 is an abundant number, since it is smaller than the sum of its proper divisors (31163868).

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

20875812 is a wasteful number, since it uses less digits than its factorization.

20875812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 20875812 is about 4569.0055810865. The cubic root of 20875812 is about 275.3474924011.

The spelling of 20875812 in words is "twenty million, eight hundred seventy-five thousand, eight hundred twelve".