523405020 has 96 divisors (see below), whose sum is σ = 1548933120. Its totient is φ = 131788800.

The previous prime is 523405013. The next prime is 523405031. The reversal of 523405020 is 20504325.

It is a super-2 number, since 2×523405020² = 547905629922400800, which contains 22 as substring.

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, 106620 + ... + 111420.

It is an arithmetic number, because the mean of its divisors is an integer number (16134720).

Almost surely, 2^523405020 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 523405020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774466560).

523405020 is an abundant number, since it is smaller than the sum of its proper divisors (1025528100).

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

523405020 is a wasteful number, since it uses less digits than its factorization.

523405020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4915 (or 4913 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 523405020 is about 22878.0466823547. The cubic root of 523405020 is about 805.8965462310.

Adding to 523405020 its reverse (20504325), we get a palindrome (543909345).

The spelling of 523405020 in words is "five hundred twenty-three million, four hundred five thousand, twenty".