20100256 has 48 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 8596480.

The previous prime is 20100253. The next prime is 20100257. The reversal of 20100256 is 65200102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20100251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4305 + ... + 7663.

It is an arithmetic number, because the mean of its divisors is an integer number (952560).

Almost surely, 2^20100256 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 20100256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22861440).

20100256 is an abundant number, since it is smaller than the sum of its proper divisors (25622624).

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

20100256 is a wasteful number, since it uses less digits than its factorization.

20100256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3397 (or 3389 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 20100256 is about 4483.3309045842. The cubic root of 20100256 is about 271.8945669803.

Adding to 20100256 its reverse (65200102), we get a palindrome (85300358).

The spelling of 20100256 in words is "twenty million, one hundred thousand, two hundred fifty-six".