20875818 has 8 divisors (see below), whose sum is σ = 41751648. Its totient is φ = 6958604.

The previous prime is 20875817. The next prime is 20875823. The reversal of 20875818 is 81857802.

20875818 is nontrivially palindromic in base 12.

It is a sphenic number, since it is the product of 3 distinct primes.

20875818 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (20875817) 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, 1739646 + ... + 1739657.

It is an arithmetic number, because the mean of its divisors is an integer number (5218956).

Almost surely, 2^20875818 is an apocalyptic number.

20875818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20875818 is a wasteful number, since it uses less digits than its factorization.

20875818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479308.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 20875818 is about 4569.0062376845. The cubic root of 20875818 is about 275.3475187806.

The spelling of 20875818 in words is "twenty million, eight hundred seventy-five thousand, eight hundred eighteen".