515050020 has 108 divisors (see below), whose sum is σ = 1659793044. Its totient is φ = 129254400.

The previous prime is 515050013. The next prime is 515050021. The reversal of 515050020 is 20050515.

It can be written as a sum of positive squares in 6 ways, for example, as 125619264 + 389430756 = 11208^2 + 19734^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 515049975 and 515050002.

It is not an unprimeable number, because it can be changed into a prime (515050021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 47070 + ... + 56970.

Almost surely, 2^515050020 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 515050020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829896522).

515050020 is an abundant number, since it is smaller than the sum of its proper divisors (1144743024).

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

515050020 is a wasteful number, since it uses less digits than its factorization.

515050020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9950 (or 9928 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 18.

The square root of 515050020 is about 22694.7134813375. The cubic root of 515050020 is about 801.5854081092.

The spelling of 515050020 in words is "five hundred fifteen million, fifty thousand, twenty".