505005550020 has 240 divisors, whose sum is σ = 1601068569408. Its totient is φ = 133794011520.

The previous prime is 505005550019. The next prime is 505005550033. The reversal of 505005550020 is 20055500505.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 79 ways as a sum of consecutive naturals, for example, 61800535 + ... + 61808705.

Almost surely, 2^505005550020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505005550020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800534284704).

505005550020 is an abundant number, since it is smaller than the sum of its proper divisors (1096063019388).

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

505005550020 is an equidigital number, since it uses as much as digits as its factorization.

505005550020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364 (or 8338 counting only the distinct ones).

The product of its (nonzero) digits is 6250, while the sum is 27.

The spelling of 505005550020 in words is "five hundred five billion, five million, five hundred fifty thousand, twenty".