30918020 has 48 divisors (see below), whose sum is σ = 75734400. Its totient is φ = 10598112.

The previous prime is 30918007. The next prime is 30918037. The reversal of 30918020 is 2081903.

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, 4607 + ... + 9113.

It is an arithmetic number, because the mean of its divisors is an integer number (1577800).

Almost surely, 2^30918020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30918020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37867200).

30918020 is an abundant number, since it is smaller than the sum of its proper divisors (44816380).

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

30918020 is a wasteful number, since it uses less digits than its factorization.

30918020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537 (or 4521 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 30918020 is about 5560.3974678075. The cubic root of 30918020 is about 313.8609063849.

Adding to 30918020 its reverse (2081903), we get a palindrome (32999923).

It can be divided in two parts, 3091 and 8020, that added together give a palindrome (11111).

The spelling of 30918020 in words is "thirty million, nine hundred eighteen thousand, twenty".