30185920 has 28 divisors (see below), whose sum is σ = 71880984. Its totient is φ = 12074240.

The previous prime is 30185917. The next prime is 30185923. The reversal of 30185920 is 2958103.

It is an interprime number because it is at equal distance from previous prime (30185917) and next prime (30185923).

It is a super-2 number, since 2×30185920² = 1822379532492800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30185923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46846 + ... + 47485.

It is an arithmetic number, because the mean of its divisors is an integer number (2567178).

Almost surely, 2^30185920 is an apocalyptic number.

It is an amenable number.

30185920 is an abundant number, since it is smaller than the sum of its proper divisors (41695064).

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

30185920 is an equidigital number, since it uses as much as digits as its factorization.

30185920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94348 (or 94338 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 30185920 is about 5494.1714570989. The cubic root of 30185920 is about 311.3638143359.

The spelling of 30185920 in words is "thirty million, one hundred eighty-five thousand, nine hundred twenty".