30020040 has 48 divisors (see below), whose sum is σ = 97566300. Its totient is φ = 8005248.

The previous prime is 30019963. The next prime is 30020041. The reversal of 30020040 is 4002003.

It can be written as a sum of positive squares in 2 ways, for example, as 29877156 + 142884 = 5466^2 + 378^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (30020041) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41335 + ... + 42054.

Almost surely, 2^30020040 is an apocalyptic number.

30020040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30020040 is an abundant number, since it is smaller than the sum of its proper divisors (67546260).

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

30020040 is a wasteful number, since it uses less digits than its factorization.

30020040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83406 (or 83399 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 30020040 is about 5479.0546629870. The cubic root of 30020040 is about 310.7924229058.

Adding to 30020040 its reverse (4002003), we get a palindrome (34022043).

The spelling of 30020040 in words is "thirty million, twenty thousand, forty".