30509920 has 48 divisors (see below), whose sum is σ = 82379808. Its totient is φ = 10460160.

The previous prime is 30509893. The next prime is 30509923. The reversal of 30509920 is 2990503.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30509923) 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 7 ways as a sum of consecutive naturals, for example, 12501 + ... + 14740.

It is an arithmetic number, because the mean of its divisors is an integer number (1716246).

Almost surely, 2^30509920 is an apocalyptic number.

It is an amenable number.

30509920 is an abundant number, since it is smaller than the sum of its proper divisors (51869888).

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

30509920 is a wasteful number, since it uses less digits than its factorization.

30509920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27263 (or 27255 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 30509920 is about 5523.5785501792. The cubic root of 30509920 is about 312.4738580798.

The spelling of 30509920 in words is "thirty million, five hundred nine thousand, nine hundred twenty".