20004241520 has 80 divisors (see below), whose sum is σ = 47654949888. Its totient is φ = 7805809920.

The previous prime is 20004241493. The next prime is 20004241529. The reversal of 20004241520 is 2514240002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 20004241492 and 20004241501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004241529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160807 + ... + 1177913.

Almost surely, 2^20004241520 is an apocalyptic number.

20004241520 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 20004241520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23827474944).

20004241520 is an abundant number, since it is smaller than the sum of its proper divisors (27650708368).

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

20004241520 is a wasteful number, since it uses less digits than its factorization.

20004241520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17478 (or 17472 counting only the distinct ones).

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

Adding to 20004241520 its reverse (2514240002), we get a palindrome (22518481522).

The spelling of 20004241520 in words is "twenty billion, four million, two hundred forty-one thousand, five hundred twenty".