20615853448 has 8 divisors (see below), whose sum is σ = 38654725230. Its totient is φ = 10307926720.

The previous prime is 20615853421. The next prime is 20615853463. The reversal of 20615853448 is 84435851602.

It can be written as a sum of positive squares in only one way, i.e., 20598564484 + 17288964 = 143522^2 + 4158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20615853398 and 20615853407.

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 as a sum of consecutive naturals, namely, 1288490833 + ... + 1288490848.

Almost surely, 2^20615853448 is an apocalyptic number.

It is an amenable number.

20615853448 is a deficient number, since it is larger than the sum of its proper divisors (18038871782).

20615853448 is a wasteful number, since it uses less digits than its factorization.

20615853448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576981687 (or 2576981683 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 20615853448 in words is "twenty billion, six hundred fifteen million, eight hundred fifty-three thousand, four hundred forty-eight".