30013520 has 20 divisors (see below), whose sum is σ = 69781620. Its totient is φ = 12005376.

The previous prime is 30013513. The next prime is 30013523. The reversal of 30013520 is 2531003.

It can be written as a sum of positive squares in 2 ways, for example, as 23001616 + 7011904 = 4796^2 + 2648^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×30013520² = 1801622765580800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30013495 and 30013504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30013523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187505 + ... + 187664.

It is an arithmetic number, because the mean of its divisors is an integer number (3489081).

Almost surely, 2^30013520 is an apocalyptic number.

It is an amenable number.

30013520 is an abundant number, since it is smaller than the sum of its proper divisors (39768100).

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

30013520 is a wasteful number, since it uses less digits than its factorization.

30013520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375182 (or 375176 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 30013520 is about 5478.4596375259. The cubic root of 30013520 is about 310.7699211223.

Adding to 30013520 its reverse (2531003), we get a palindrome (32544523).

The spelling of 30013520 in words is "thirty million, thirteen thousand, five hundred twenty".