20008790505 has 120 divisors (see below), whose sum is σ = 40699583232. Its totient is φ = 9387576000.

The previous prime is 20008790489. The next prime is 20008790513. The reversal of 20008790505 is 50509780002.

It is not a de Polignac number, because 20008790505 - 2⁴ = 20008790489 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20008790505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1512570 + ... + 1525740.

Almost surely, 2^20008790505 is an apocalyptic number.

It is an amenable number.

20008790505 is an abundant number, since it is smaller than the sum of its proper divisors (20690792727).

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

20008790505 is a wasteful number, since it uses less digits than its factorization.

20008790505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13241 (or 13221 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 20008790505 in words is "twenty billion, eight million, seven hundred ninety thousand, five hundred five".