30213720 has 192 divisors, whose sum is σ = 106142400. Its totient is φ = 7434240.

The previous prime is 30213707. The next prime is 30213739. The reversal of 30213720 is 2731203.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 30213693 and 30213702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 339436 + ... + 339524.

It is an arithmetic number, because the mean of its divisors is an integer number (552825).

Almost surely, 2^30213720 is an apocalyptic number.

30213720 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30213720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53071200).

30213720 is an abundant number, since it is smaller than the sum of its proper divisors (75928680).

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

30213720 is a wasteful number, since it uses less digits than its factorization.

30213720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 30213720 is about 5496.7008286790. The cubic root of 30213720 is about 311.4593694617.

Adding to 30213720 its reverse (2731203), we get a palindrome (32944923).

The spelling of 30213720 in words is "thirty million, two hundred thirteen thousand, seven hundred twenty".