20280258256 has 120 divisors (see below), whose sum is σ = 43289026200. Its totient is φ = 9194766336.

The previous prime is 20280258253. The next prime is 20280258277. The reversal of 20280258256 is 65285208202.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 35521600 + 20244736656 = 5960^2 + 142284^2 .

It is a super-2 number, since 2×20280258256² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20280258253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19332420 + ... + 19333468.

It is an arithmetic number, because the mean of its divisors is an integer number (360741885).

Almost surely, 2^20280258256 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 20280258256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21644513100).

20280258256 is an abundant number, since it is smaller than the sum of its proper divisors (23008767944).

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

20280258256 is a wasteful number, since it uses less digits than its factorization.

20280258256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241 (or 1218 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 40.

The spelling of 20280258256 in words is "twenty billion, two hundred eighty million, two hundred fifty-eight thousand, two hundred fifty-six".