2001520 has 40 divisors (see below), whose sum is σ = 4713984. Its totient is φ = 790272.

The previous prime is 2001511. The next prime is 2001533. The reversal of 2001520 is 251002.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 2001497 and 2001506.

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, 10062 + ... + 10258.

2^2001520 is an apocalyptic number.

2001520 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 2001520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2356992).

2001520 is an abundant number, since it is smaller than the sum of its proper divisors (2712464).

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

2001520 is a wasteful number, since it uses less digits than its factorization.

2001520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 331 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 2001520 is about 1414.7508614594. The cubic root of 2001520 is about 126.0240149069.

Adding to 2001520 its reverse (251002), we get a palindrome (2252522).

The spelling of 2001520 in words is "two million, one thousand, five hundred twenty".