2001004520 has 32 divisors (see below), whose sum is σ = 4504566600. Its totient is φ = 799991808.

The previous prime is 2001004487. The next prime is 2001004547. The reversal of 2001004520 is 254001002.

It can be written as a sum of positive squares in 4 ways, for example, as 1642356676 + 358647844 = 40526^2 + 18938^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2001004495 and 2001004504.

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, 73412 + ... + 96908.

Almost surely, 2^2001004520 is an apocalyptic number.

2001004520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2001004520 is an abundant number, since it is smaller than the sum of its proper divisors (2503562080).

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

2001004520 is a wasteful number, since it uses less digits than its factorization.

2001004520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25637 (or 25633 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 2001004520 is about 44732.5890151688. The cubic root of 2001004520 is about 1260.1319505720.

Adding to 2001004520 its reverse (254001002), we get a palindrome (2255005522).

The spelling of 2001004520 in words is "two billion, one million, four thousand, five hundred twenty".