30312131330020 has 48 divisors (see below), whose sum is σ = 63895600682928. Its totient is φ = 12079144097280.

The previous prime is 30312131329979. The next prime is 30312131330029. The reversal of 30312131330020 is 2003313121303.

It can be written as a sum of positive squares in 8 ways, for example, as 12143719526656 + 18168411803364 = 3484784^2 + 4262442^2 .

It is a junction number, because it is equal to n+sod(n) for n = 30312131329973 and 30312131330000.

It is not an unprimeable number, because it can be changed into a prime (30312131330029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15465730 + ... + 17315110.

It is an arithmetic number, because the mean of its divisors is an integer number (1331158347561).

Almost surely, 2^{30312131330020} is an apocalyptic number.

It is an amenable number.

30312131330020 is an abundant number, since it is smaller than the sum of its proper divisors (33583469352908).

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

30312131330020 is a wasteful number, since it uses less digits than its factorization.

30312131330020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852480 (or 1852478 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 30312131330020 its reverse (2003313121303), we get a palindrome (32315444451323).

The spelling of 30312131330020 in words is "thirty trillion, three hundred twelve billion, one hundred thirty-one million, three hundred thirty thousand, twenty".