31100323020 has 144 divisors (see below), whose sum is σ = 94779447840. Its totient is φ = 7616114688.

The previous prime is 31100323003. The next prime is 31100323043. The reversal of 31100323020 is 2032300113.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1989796 + ... + 2005364.

It is an arithmetic number, because the mean of its divisors is an integer number (658190610).

Almost surely, 2^31100323020 is an apocalyptic number.

31100323020 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 31100323020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47389723920).

31100323020 is an abundant number, since it is smaller than the sum of its proper divisors (63679124820).

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

31100323020 is a wasteful number, since it uses less digits than its factorization.

31100323020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15804 (or 15789 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 31100323020 its reverse (2032300113), we get a palindrome (33132623133).

The spelling of 31100323020 in words is "thirty-one billion, one hundred million, three hundred twenty-three thousand, twenty".