521750020 has 96 divisors (see below), whose sum is σ = 1260645120. Its totient is φ = 179612160.

The previous prime is 521750017. The next prime is 521750023. The reversal of 521750020 is 20057125.

It is an interprime number because it is at equal distance from previous prime (521750017) and next prime (521750023).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 521749973 and 521750000.

It is not an unprimeable number, because it can be changed into a prime (521750023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337369 + ... + 338911.

It is an arithmetic number, because the mean of its divisors is an integer number (13131720).

Almost surely, 2^521750020 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 521750020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (630322560).

521750020 is an abundant number, since it is smaller than the sum of its proper divisors (738895100).

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

521750020 is a wasteful number, since it uses less digits than its factorization.

521750020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1645 (or 1643 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 521750020 is about 22841.8479987938. The cubic root of 521750020 is about 805.0462378441.

The spelling of 521750020 in words is "five hundred twenty-one million, seven hundred fifty thousand, twenty".