20010281256 has 256 divisors, whose sum is σ = 67445913600. Its totient is φ = 5366172672.

The previous prime is 20010281219. The next prime is 20010281261. The reversal of 20010281256 is 65218201002.

It is a happy number.

It is a super-2 number, since 2×20010281256² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12002935 + ... + 12004601.

It is an arithmetic number, because the mean of its divisors is an integer number (263460600).

Almost surely, 2^20010281256 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 20010281256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33722956800).

20010281256 is an abundant number, since it is smaller than the sum of its proper divisors (47435632344).

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

20010281256 is a wasteful number, since it uses less digits than its factorization.

20010281256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173 (or 2163 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 20010281256 its reverse (65218201002), we get a palindrome (85228482258).

The spelling of 20010281256 in words is "twenty billion, ten million, two hundred eighty-one thousand, two hundred fifty-six".