505550020 has 12 divisors (see below), whose sum is σ = 1061655084. Its totient is φ = 202220000.

The previous prime is 505549999. The next prime is 505550027. The reversal of 505550020 is 20055505.

It can be written as a sum of positive squares in 2 ways, for example, as 68823616 + 436726404 = 8296^2 + 20898^2 .

It is a junction number, because it is equal to n+sod(n) for n = 505549973 and 505550000.

It is not an unprimeable number, because it can be changed into a prime (505550027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12638731 + ... + 12638770.

It is an arithmetic number, because the mean of its divisors is an integer number (88471257).

Almost surely, 2^505550020 is an apocalyptic number.

It is an amenable number.

505550020 is an abundant number, since it is smaller than the sum of its proper divisors (556105064).

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

505550020 is a wasteful number, since it uses less digits than its factorization.

505550020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25277510 (or 25277508 counting only the distinct ones).

The product of its (nonzero) digits is 1250, while the sum is 22.

The square root of 505550020 is about 22484.4395082466. The cubic root of 505550020 is about 796.6264291888.

The spelling of 505550020 in words is "five hundred five million, five hundred fifty thousand, twenty".