20505505512 has 32 divisors (see below), whose sum is σ = 51452945280. Its totient is φ = 6809944320.

The previous prime is 20505505499. The next prime is 20505505529. The reversal of 20505505512 is 21550550502.

It is a self number, because there is not a number n which added to its sum of digits gives 20505505512.

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, 1569873 + ... + 1582880.

It is an arithmetic number, because the mean of its divisors is an integer number (1607904540).

Almost surely, 2^20505505512 is an apocalyptic number.

It is an amenable number.

20505505512 is an abundant number, since it is smaller than the sum of its proper divisors (30947439768).

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

20505505512 is a wasteful number, since it uses less digits than its factorization.

20505505512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153033 (or 3153029 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 30.

The spelling of 20505505512 in words is "twenty billion, five hundred five million, five hundred five thousand, five hundred twelve".