20255886 has 64 divisors (see below), whose sum is σ = 52738560. Its totient is φ = 5641920.

The previous prime is 20255839. The next prime is 20255897. The reversal of 20255886 is 68855202.

20255886 is a `hidden beast` number, since 20 + 2 + 558 + 86 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20255886.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 14845 + ... + 16151.

It is an arithmetic number, because the mean of its divisors is an integer number (824040).

Almost surely, 2^20255886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20255886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26369280).

20255886 is an abundant number, since it is smaller than the sum of its proper divisors (32482674).

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

20255886 is a wasteful number, since it uses less digits than its factorization.

20255886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 20255886 is about 4500.6539524829. The cubic root of 20255886 is about 272.5944951858.

The spelling of 20255886 in words is "twenty million, two hundred fifty-five thousand, eight hundred eighty-six".