30105520 has 40 divisors (see below), whose sum is σ = 70669584. Its totient is φ = 11926272.

The previous prime is 30105499. The next prime is 30105529. The reversal of 30105520 is 2550103.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 30105494 and 30105503.

It is not an unprimeable number, because it can be changed into a prime (30105529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6802 + ... + 10318.

Almost surely, 2^30105520 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 30105520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35334792).

30105520 is an abundant number, since it is smaller than the sum of its proper divisors (40564064).

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

30105520 is a wasteful number, since it uses less digits than its factorization.

30105520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637 (or 3631 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 16.

The square root of 30105520 is about 5486.8497336814. The cubic root of 30105520 is about 311.0871300487.

Adding to 30105520 its reverse (2550103), we get a palindrome (32655623).

It can be divided in two parts, 30105 and 520, that added together give a square (30625 = 175²).

The spelling of 30105520 in words is "thirty million, one hundred five thousand, five hundred twenty".