31103201110020 has 288 divisors, whose sum is σ = 100434502433664. Its totient is φ = 7144674662400.

The previous prime is 31103201109977. The next prime is 31103201110063. The reversal of 31103201110020 is 2001110230113.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31103201109977) and next prime (31103201110063).

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 (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15998155 + ... + 17836685.

It is an arithmetic number, because the mean of its divisors is an integer number (348730911228).

Almost surely, 2^{31103201110020} is an apocalyptic number.

31103201110020 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 31103201110020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50217251216832).

31103201110020 is an abundant number, since it is smaller than the sum of its proper divisors (69331301323644).

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

31103201110020 is a wasteful number, since it uses less digits than its factorization.

31103201110020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838643 (or 1838618 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31103201110020 its reverse (2001110230113), we get a palindrome (33104311340133).

The spelling of 31103201110020 in words is "thirty-one trillion, one hundred three billion, two hundred one million, one hundred ten thousand, twenty".