20265856 has 64 divisors (see below), whose sum is σ = 45838800. Its totient is φ = 8847360.

The previous prime is 20265823. The next prime is 20265859. The reversal of 20265856 is 65856202.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20265859) 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 7 ways as a sum of consecutive naturals, for example, 31296 + ... + 31936.

Almost surely, 2^20265856 is an apocalyptic number.

20265856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20265856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22919400).

20265856 is an abundant number, since it is smaller than the sum of its proper divisors (25572944).

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

20265856 is a wasteful number, since it uses less digits than its factorization.

20265856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20265856 is about 4501.7614330393. The cubic root of 20265856 is about 272.6392117576.

The spelling of 20265856 in words is "twenty million, two hundred sixty-five thousand, eight hundred fifty-six".