311400020 has 12 divisors (see below), whose sum is σ = 653940084. Its totient is φ = 124560000.

The previous prime is 311400007. The next prime is 311400071. The reversal of 311400020 is 20004113.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 220997956 + 90402064 = 14866^2 + 9508^2 .

It is a junction number, because it is equal to n+sod(n) for n = 311399974 and 311400010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7784981 + ... + 7785020.

It is an arithmetic number, because the mean of its divisors is an integer number (54495007).

Almost surely, 2^311400020 is an apocalyptic number.

It is an amenable number.

311400020 is an abundant number, since it is smaller than the sum of its proper divisors (342540064).

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

311400020 is a wasteful number, since it uses less digits than its factorization.

311400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15570010 (or 15570008 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 311400020 is about 17646.5299705069. The cubic root of 311400020 is about 677.8072534187.

Adding to 311400020 its reverse (20004113), we get a palindrome (331404133).

The spelling of 311400020 in words is "three hundred eleven million, four hundred thousand, twenty".