20415320144 has 20 divisors (see below), whose sum is σ = 39773222580. Its totient is φ = 10151262720.

The previous prime is 20415320143. The next prime is 20415320171. The reversal of 20415320144 is 44102351402.

It can be written as a sum of positive squares in 2 ways, for example, as 4504020544 + 15911299600 = 67112^2 + 126140^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20415320143) 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 3 ways as a sum of consecutive naturals, for example, 3521849 + ... + 3527640.

It is an arithmetic number, because the mean of its divisors is an integer number (1988661129).

Almost surely, 2^20415320144 is an apocalyptic number.

It is an amenable number.

20415320144 is a deficient number, since it is larger than the sum of its proper divisors (19357902436).

20415320144 is a wasteful number, since it uses less digits than its factorization.

20415320144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7049678 (or 7049672 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 20415320144 its reverse (44102351402), we get a palindrome (64517671546).

The spelling of 20415320144 in words is "twenty billion, four hundred fifteen million, three hundred twenty thousand, one hundred forty-four".