20505566548 has 24 divisors (see below), whose sum is σ = 36138060000. Its totient is φ = 10180454688.

The previous prime is 20505566539. The next prime is 20505566573. The reversal of 20505566548 is 84566550502.

It is a junction number, because it is equal to n+sod(n) for n = 20505566498 and 20505566507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2968803 + ... + 2975701.

It is an arithmetic number, because the mean of its divisors is an integer number (1505752500).

Almost surely, 2^20505566548 is an apocalyptic number.

It is an amenable number.

20505566548 is a deficient number, since it is larger than the sum of its proper divisors (15632493452).

20505566548 is a wasteful number, since it uses less digits than its factorization.

20505566548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12039 (or 12037 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 46.

The spelling of 20505566548 in words is "twenty billion, five hundred five million, five hundred sixty-six thousand, five hundred forty-eight".