521365020 has 96 divisors (see below), whose sum is σ = 1631460096. Its totient is φ = 123302400.

The previous prime is 521365001. The next prime is 521365049. The reversal of 521365020 is 20563125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17427 + ... + 36693.

It is an arithmetic number, because the mean of its divisors is an integer number (16994376).

Almost surely, 2^521365020 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 521365020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815730048).

521365020 is an abundant number, since it is smaller than the sum of its proper divisors (1110095076).

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

521365020 is a wasteful number, since it uses less digits than its factorization.

521365020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19331 (or 19329 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 521365020 is about 22833.4189292800. The cubic root of 521365020 is about 804.8481742398.

The spelling of 521365020 in words is "five hundred twenty-one million, three hundred sixty-five thousand, twenty".