20535215144 has 32 divisors (see below), whose sum is σ = 40777036200. Its totient is φ = 9661593600.

The previous prime is 20535215111. The next prime is 20535215159. The reversal of 20535215144 is 44151253502.

It can be written as a sum of positive squares in 4 ways, for example, as 19645386244 + 889828900 = 140162^2 + 29830^2 .

It is a super-2 number, since 2×20535215144² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20535215144.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 775922 + ... + 801950.

Almost surely, 2^20535215144 is an apocalyptic number.

It is an amenable number.

20535215144 is a deficient number, since it is larger than the sum of its proper divisors (20241821056).

20535215144 is a wasteful number, since it uses less digits than its factorization.

20535215144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31853 (or 31849 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 20535215144 its reverse (44151253502), we get a palindrome (64686468646).

The spelling of 20535215144 in words is "twenty billion, five hundred thirty-five million, two hundred fifteen thousand, one hundred forty-four".