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30020 = 2251979

30020 has 24 divisors (see below), whose sum is σ = 67200. Its totient is φ = 11232.

The previous prime is 30013. The next prime is 30029. The reversal of 30020 is 2003.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 29986 and 30013.

It is not an unprimeable number, because it can be changed into a prime (30029) by changing a digit.

30020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341 + ... + 419.

It is an arithmetic number, because the mean of its divisors is an integer number (2800).

230020 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 30020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33600).

30020 is an abundant number, since it is smaller than the sum of its proper divisors (37180).

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

30020 is a wasteful number, since it uses less digits than its factorization.

30020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 5.

The square root of 30020 is about 173.2628061645. The cubic root of 30020 is about 31.0792284868.

Adding to 30020 its reverse (2003), we get a palindrome (32023).

The spelling of 30020 in words is "thirty thousand, twenty".

Divisors: 1 2 4 5 10 19 20 38 76 79 95 158 190 316 380 395 790 1501 1580 3002 6004 7505 15010 30020