311540020 has 48 divisors (see below), whose sum is σ = 714909888. Its totient is φ = 113096960.

The previous prime is 311539999. The next prime is 311540027. The reversal of 311540020 is 20045113.

It is a junction number, because it is equal to n+sod(n) for n = 311539976 and 311540003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311540027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260544 + ... + 261736.

It is an arithmetic number, because the mean of its divisors is an integer number (14893956).

Almost surely, 2^311540020 is an apocalyptic number.

It is an amenable number.

311540020 is an abundant number, since it is smaller than the sum of its proper divisors (403369868).

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

311540020 is a wasteful number, since it uses less digits than its factorization.

311540020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2400 (or 2398 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 311540020 is about 17650.4963103024. The cubic root of 311540020 is about 677.9088149603.

Adding to 311540020 its reverse (20045113), we get a palindrome (331585133).

The spelling of 311540020 in words is "three hundred eleven million, five hundred forty thousand, twenty".