20000256 has 80 divisors (see below), whose sum is σ = 55242000. Its totient is φ = 6422528.

The previous prime is 20000243. The next prime is 20000269. The reversal of 20000256 is 65200002.

It is an interprime number because it is at equal distance from previous prime (20000243) and next prime (20000269).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44320 + ... + 44768.

It is an arithmetic number, because the mean of its divisors is an integer number (690525).

Almost surely, 2^20000256 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 20000256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27621000).

20000256 is an abundant number, since it is smaller than the sum of its proper divisors (35241744).

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

20000256 is an equidigital number, since it uses as much as digits as its factorization.

20000256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20000256 is about 4472.1645765781. The cubic root of 20000256 is about 271.4429198061.

Adding to 20000256 its reverse (65200002), we get a palindrome (85200258).

The spelling of 20000256 in words is "twenty million, two hundred fifty-six", and thus it is an aban number.