31303301220 has 144 divisors (see below), whose sum is σ = 104005989360. Its totient is φ = 7585579008.

The previous prime is 31303301209. The next prime is 31303301233. The reversal of 31303301220 is 2210330313.

31303301220 is a `hidden beast` number, since 313 + 0 + 330 + 1 + 2 + 20 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1177450596 + 30125850624 = 34314^2 + 173568^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31303301193 and 31303301202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87637 + ... + 265116.

It is an arithmetic number, because the mean of its divisors is an integer number (722263815).

Almost surely, 2^31303301220 is an apocalyptic number.

31303301220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31303301220 is an abundant number, since it is smaller than the sum of its proper divisors (72702688140).

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

31303301220 is a wasteful number, since it uses less digits than its factorization.

31303301220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352814 (or 352809 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

Adding to 31303301220 its reverse (2210330313), we get a palindrome (33513631533).

The spelling of 31303301220 in words is "thirty-one billion, three hundred three million, three hundred one thousand, two hundred twenty".