91101000020 has 24 divisors (see below), whose sum is σ = 193005132264. Its totient is φ = 36117917696.

The previous prime is 91101000013. The next prime is 91101000061. The reversal of 91101000020 is 2000010119.

It can be written as a sum of positive squares in 4 ways, for example, as 11358017476 + 79742982544 = 106574^2 + 282388^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91100999959 and 91101000004.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 20152829 + ... + 20157348.

It is an arithmetic number, because the mean of its divisors is an integer number (8041880511).

Almost surely, 2^91101000020 is an apocalyptic number.

It is an amenable number.

91101000020 is an abundant number, since it is smaller than the sum of its proper divisors (101904132244).

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

91101000020 is a wasteful number, since it uses less digits than its factorization.

91101000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40310299 (or 40310297 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 91101000020 its reverse (2000010119), we get a palindrome (93101010139).

The spelling of 91101000020 in words is "ninety-one billion, one hundred one million, twenty", and thus it is an aban number.