30312020 has 24 divisors (see below), whose sum is σ = 67400424. Its totient is φ = 11411456.

The previous prime is 30312013. The next prime is 30312053. The reversal of 30312020 is 2021303.

It can be written as a sum of positive squares in 4 ways, for example, as 3147076 + 27164944 = 1774^2 + 5212^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30311992 and 30312010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44237 + ... + 44916.

It is an arithmetic number, because the mean of its divisors is an integer number (2808351).

Almost surely, 2^30312020 is an apocalyptic number.

It is an amenable number.

30312020 is an abundant number, since it is smaller than the sum of its proper divisors (37088404).

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

30312020 is a wasteful number, since it uses less digits than its factorization.

30312020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89179 (or 89177 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 30312020 is about 5505.6352948593. The cubic root of 30312020 is about 311.7967803297.

Adding to 30312020 its reverse (2021303), we get a palindrome (32333323).

The spelling of 30312020 in words is "thirty million, three hundred twelve thousand, twenty".