30705520 has 40 divisors (see below), whose sum is σ = 75151440. Its totient is φ = 11635200.

The previous prime is 30705511. The next prime is 30705551. The reversal of 30705520 is 2550703.

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

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 30705491 and 30705500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8581 + ... + 11620.

It is an arithmetic number, because the mean of its divisors is an integer number (1878786).

Almost surely, 2^30705520 is an apocalyptic number.

It is an amenable number.

30705520 is an abundant number, since it is smaller than the sum of its proper divisors (44445920).

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

30705520 is a wasteful number, since it uses less digits than its factorization.

30705520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20233 (or 20227 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 22.

The square root of 30705520 is about 5541.2561752729. The cubic root of 30705520 is about 313.1401958487.

The spelling of 30705520 in words is "thirty million, seven hundred five thousand, five hundred twenty".