30840020 has 48 divisors (see below), whose sum is σ = 66528000. Its totient is φ = 12005760.

The previous prime is 30839999. The next prime is 30840041. The reversal of 30840020 is 2004803.

It is an interprime number because it is at equal distance from previous prime (30839999) and next prime (30840041).

It is a super-2 number, since 2×30840020² = 1902213667200800, which contains 22 as substring.

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, 206906 + ... + 207054.

It is an arithmetic number, because the mean of its divisors is an integer number (1386000).

Almost surely, 2^30840020 is an apocalyptic number.

It is an amenable number.

30840020 is an abundant number, since it is smaller than the sum of its proper divisors (35687980).

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

30840020 is a wasteful number, since it uses less digits than its factorization.

30840020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 30840020 is about 5553.3791514717. The cubic root of 30840020 is about 313.5967479576.

Adding to 30840020 its reverse (2004803), we get a palindrome (32844823).

The spelling of 30840020 in words is "thirty million, eight hundred forty thousand, twenty".