20324550145440 has 96 divisors (see below), whose sum is σ = 66805912688256. Its totient is φ = 5184233077760.

The previous prime is 20324550145421. The next prime is 20324550145447. The reversal of 20324550145440 is 4454105542302.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×20324550145440² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20324550145447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 920484891 + ... + 920506970.

It is an arithmetic number, because the mean of its divisors is an integer number (695894923836).

Almost surely, 2^{20324550145440} is an apocalyptic number.

20324550145440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20324550145440 is an abundant number, since it is smaller than the sum of its proper divisors (46481362542816).

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

20324550145440 is a wasteful number, since it uses less digits than its factorization.

20324550145440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1840991902 (or 1840991894 counting only the distinct ones).

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

Adding to 20324550145440 its reverse (4454105542302), we get a palindrome (24778655687742).

The spelling of 20324550145440 in words is "twenty trillion, three hundred twenty-four billion, five hundred fifty million, one hundred forty-five thousand, four hundred forty".