30003920 has 20 divisors (see below), whose sum is σ = 69759300. Its totient is φ = 12001536.

The previous prime is 30003917. The next prime is 30003931. The reversal of 30003920 is 2930003.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4682896 + 25321024 = 2164^2 + 5032^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187445 + ... + 187604.

It is an arithmetic number, because the mean of its divisors is an integer number (3487965).

Almost surely, 2^30003920 is an apocalyptic number.

It is an amenable number.

30003920 is an abundant number, since it is smaller than the sum of its proper divisors (39755380).

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

30003920 is a wasteful number, since it uses less digits than its factorization.

30003920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375062 (or 375056 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 30003920 is about 5477.5834087670. The cubic root of 30003920 is about 310.7367837298.

Adding to 30003920 its reverse (2930003), we get a palindrome (32933923).

The spelling of 30003920 in words is "thirty million, three thousand, nine hundred twenty".