20145245423520 has 192 divisors, whose sum is σ = 72541213065216. Its totient is φ = 4603463746560.

The previous prime is 20145245423519. The next prime is 20145245423579. The reversal of 20145245423520 is 2532454254102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12573435 + ... + 14084805.

It is an arithmetic number, because the mean of its divisors is an integer number (377818818048).

Almost surely, 2^{20145245423520} is an apocalyptic number.

20145245423520 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 20145245423520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36270606532608).

20145245423520 is an abundant number, since it is smaller than the sum of its proper divisors (52395967641696).

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

20145245423520 is a wasteful number, since it uses less digits than its factorization.

20145245423520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515363 (or 1515355 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 39.

Adding to 20145245423520 its reverse (2532454254102), we get a palindrome (22677699677622).

The spelling of 20145245423520 in words is "twenty trillion, one hundred forty-five billion, two hundred forty-five million, four hundred twenty-three thousand, five hundred twenty".