30820020 has 144 divisors (see below), whose sum is σ = 109626048. Its totient is φ = 6397440.

The previous prime is 30820019. The next prime is 30820051. The reversal of 30820020 is 2002803.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 31864 + ... + 32816.

It is an arithmetic number, because the mean of its divisors is an integer number (761292).

Almost surely, 2^30820020 is an apocalyptic number.

30820020 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 30820020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54813024).

30820020 is an abundant number, since it is smaller than the sum of its proper divisors (78806028).

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

30820020 is a wasteful number, since it uses less digits than its factorization.

30820020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 30820020 is about 5551.5781540027. The cubic root of 30820020 is about 313.5289432972.

Adding to 30820020 its reverse (2002803), we get a palindrome (32822823).

The spelling of 30820020 in words is "thirty million, eight hundred twenty thousand, twenty".