30705020 has 48 divisors (see below), whose sum is σ = 66679200. Its totient is φ = 11870976.

The previous prime is 30705019. The next prime is 30705049. The reversal of 30705020 is 2050703.

It is a self number, because there is not a number n which added to its sum of digits gives 30705020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87806 + ... + 88154.

It is an arithmetic number, because the mean of its divisors is an integer number (1389150).

Almost surely, 2^30705020 is an apocalyptic number.

It is an amenable number.

30705020 is an abundant number, since it is smaller than the sum of its proper divisors (35974180).

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

30705020 is a wasteful number, since it uses less digits than its factorization.

30705020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 492 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 17.

The square root of 30705020 is about 5541.2110589654. The cubic root of 30705020 is about 313.1384961441.

Adding to 30705020 its reverse (2050703), we get a palindrome (32755723).

The spelling of 30705020 in words is "thirty million, seven hundred five thousand, twenty".