20001255504 has 80 divisors (see below), whose sum is σ = 52481105280. Its totient is φ = 6562716160.

The previous prime is 20001255503. The next prime is 20001255509. The reversal of 20001255504 is 40555210002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001255503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2302882 + ... + 2311550.

It is an arithmetic number, because the mean of its divisors is an integer number (656013816).

Almost surely, 2^20001255504 is an apocalyptic number.

20001255504 is a gapful number since it is divisible by the number (24) 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 20001255504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26240552640).

20001255504 is an abundant number, since it is smaller than the sum of its proper divisors (32479849776).

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

20001255504 is a wasteful number, since it uses less digits than its factorization.

20001255504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9428 (or 9422 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

Adding to 20001255504 its reverse (40555210002), we get a palindrome (60556465506).

The spelling of 20001255504 in words is "twenty billion, one million, two hundred fifty-five thousand, five hundred four".