311230020 has 48 divisors (see below), whose sum is σ = 909336960. Its totient is φ = 79385856.

The previous prime is 311230009. The next prime is 311230021. The reversal of 311230020 is 20032113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 311229978 and 311230005.

It is not an unprimeable number, because it can be changed into a prime (311230021) 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, 111385 + ... + 114144.

It is an arithmetic number, because the mean of its divisors is an integer number (18944520).

Almost surely, 2^311230020 is an apocalyptic number.

311230020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

311230020 is an abundant number, since it is smaller than the sum of its proper divisors (598106940).

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

311230020 is a wasteful number, since it uses less digits than its factorization.

311230020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225564 (or 225562 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 311230020 is about 17641.7125019087. The cubic root of 311230020 is about 677.6838877578.

Adding to 311230020 its reverse (20032113), we get a palindrome (331262133).

The spelling of 311230020 in words is "three hundred eleven million, two hundred thirty thousand, twenty".