311202120020 has 96 divisors (see below), whose sum is σ = 765214563456. Its totient is φ = 105048576000.

The previous prime is 311202120017. The next prime is 311202120043. The reversal of 311202120020 is 20021202113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 311202119977 and 311202120004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 296906 + ... + 842945.

It is an arithmetic number, because the mean of its divisors is an integer number (7970985036).

Almost surely, 2^311202120020 is an apocalyptic number.

It is an amenable number.

311202120020 is an abundant number, since it is smaller than the sum of its proper divisors (454012443436).

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

311202120020 is a wasteful number, since it uses less digits than its factorization.

311202120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139961 (or 1139959 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 311202120020 its reverse (20021202113), we get a palindrome (331223322133).

The spelling of 311202120020 in words is "three hundred eleven billion, two hundred two million, one hundred twenty thousand, twenty".