311020020 has 48 divisors (see below), whose sum is σ = 967619520. Its totient is φ = 82938528.

The previous prime is 311020013. The next prime is 311020027. The reversal of 311020020 is 20020113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (311020013) and next prime (311020027).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 311019984 and 311020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311020027) 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, 287442 + ... + 288521.

It is an arithmetic number, because the mean of its divisors is an integer number (20158740).

Almost surely, 2^311020020 is an apocalyptic number.

311020020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

311020020 is an abundant number, since it is smaller than the sum of its proper divisors (656599500).

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

311020020 is a wasteful number, since it uses less digits than its factorization.

311020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575981 (or 575973 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 311020020 is about 17635.7596944390. The cubic root of 311020020 is about 677.5314328449.

Adding to 311020020 its reverse (20020113), we get a palindrome (331040133).

The spelling of 311020020 in words is "three hundred eleven million, twenty thousand, twenty".