2001244520 has 64 divisors (see below), whose sum is σ = 4938071040. Its totient is φ = 723884800.

The previous prime is 2001244517. The next prime is 2001244561. The reversal of 2001244520 is 254421002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2001244492 and 2001244501.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72134 + ... + 95946.

It is an arithmetic number, because the mean of its divisors is an integer number (77157360).

Almost surely, 2^2001244520 is an apocalyptic number.

2001244520 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 2001244520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2469035520).

2001244520 is an abundant number, since it is smaller than the sum of its proper divisors (2936826520).

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

2001244520 is a wasteful number, since it uses less digits than its factorization.

2001244520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24026 (or 24022 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 2001244520 is about 44735.2715427100. The cubic root of 2001244520 is about 1260.1823285321.

Adding to 2001244520 its reverse (254421002), we get a palindrome (2255665522).

The spelling of 2001244520 in words is "two billion, one million, two hundred forty-four thousand, five hundred twenty".