311201020 has 24 divisors (see below), whose sum is σ = 703793664. Its totient is φ = 114904896.

The previous prime is 311200999. The next prime is 311201021. The reversal of 311201020 is 20102113.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 311200988 and 311201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311201021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598204 + ... + 598723.

It is an arithmetic number, because the mean of its divisors is an integer number (29324736).

Almost surely, 2^311201020 is an apocalyptic number.

It is an amenable number.

311201020 is an abundant number, since it is smaller than the sum of its proper divisors (392592644).

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

311201020 is a wasteful number, since it uses less digits than its factorization.

311201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1196949 (or 1196947 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 311201020 is about 17640.8905670887. The cubic root of 311201020 is about 677.6628385424.

Adding to 311201020 its reverse (20102113), we get a palindrome (331303133).

The spelling of 311201020 in words is "three hundred eleven million, two hundred one thousand, twenty".