20040043452520 has 256 divisors, whose sum is σ = 58546514880000. Its totient is φ = 5995144544256.

The previous prime is 20040043452469. The next prime is 20040043452551. The reversal of 20040043452520 is 2525434004002.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30730164 + ... + 31375516.

It is an arithmetic number, because the mean of its divisors is an integer number (228697323750).

Almost surely, 2^{20040043452520} is an apocalyptic number.

20040043452520 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 20040043452520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29273257440000).

20040043452520 is an abundant number, since it is smaller than the sum of its proper divisors (38506471427480).

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

20040043452520 is a wasteful number, since it uses less digits than its factorization.

20040043452520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645852 (or 645848 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 31.

Adding to 20040043452520 its reverse (2525434004002), we get a palindrome (22565477456522).

The spelling of 20040043452520 in words is "twenty trillion, forty billion, forty-three million, four hundred fifty-two thousand, five hundred twenty".