31133300220 has 144 divisors (see below), whose sum is σ = 103190330880. Its totient is φ = 7535203200.

The previous prime is 31133300207. The next prime is 31133300243. The reversal of 31133300220 is 2200333113.

31133300220 is a `hidden beast` number, since 3 + 113 + 330 + 0 + 220 = 666.

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 = 31133300193 and 31133300202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1236921 + ... + 1261839.

It is an arithmetic number, because the mean of its divisors is an integer number (716599520).

Almost surely, 2^31133300220 is an apocalyptic number.

31133300220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31133300220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51595165440).

31133300220 is an abundant number, since it is smaller than the sum of its proper divisors (72057030660).

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

31133300220 is a wasteful number, since it uses less digits than its factorization.

31133300220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25576 (or 25571 counting only the distinct ones).

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

Adding to 31133300220 its reverse (2200333113), we get a palindrome (33333633333).

The spelling of 31133300220 in words is "thirty-one billion, one hundred thirty-three million, three hundred thousand, two hundred twenty".