30420544 has 56 divisors (see below), whose sum is σ = 75273408. Its totient is φ = 11850240.

The previous prime is 30420529. The next prime is 30420547. The reversal of 30420544 is 44502403.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (30420547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1842 + ... + 8014.

It is an arithmetic number, because the mean of its divisors is an integer number (1344168).

Almost surely, 2^30420544 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 30420544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37636704).

30420544 is an abundant number, since it is smaller than the sum of its proper divisors (44852864).

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

30420544 is a wasteful number, since it uses less digits than its factorization.

30420544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6203 (or 6193 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 30420544 is about 5515.4822091998. The cubic root of 30420544 is about 312.1684385254.

Adding to 30420544 its reverse (44502403), we get a palindrome (74922947).

The spelling of 30420544 in words is "thirty million, four hundred twenty thousand, five hundred forty-four".