2581123020 has 480 divisors, whose sum is σ = 9486650880. Its totient is φ = 521579520.

The previous prime is 2581123019. The next prime is 2581123079. The reversal of 2581123020 is 203211852.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 62954200 + ... + 62954240.

It is an arithmetic number, because the mean of its divisors is an integer number (19763856).

Almost surely, 2^2581123020 is an apocalyptic number.

2581123020 is a gapful number since it is divisible by the number (20) 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 2581123020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4743325440).

2581123020 is an abundant number, since it is smaller than the sum of its proper divisors (6905527860).

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

2581123020 is a wasteful number, since it uses less digits than its factorization.

2581123020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 2581123020 is about 50804.7539114205. The cubic root of 2581123020 is about 1371.7329412179.

Adding to 2581123020 its reverse (203211852), we get a palindrome (2784334872).

The spelling of 2581123020 in words is "two billion, five hundred eighty-one million, one hundred twenty-three thousand, twenty".