91910020 has 24 divisors (see below), whose sum is σ = 193195800. Its totient is φ = 36728832.

The previous prime is 91910017. The next prime is 91910057. The reversal of 91910020 is 2001919.

It can be written as a sum of positive squares in 4 ways, for example, as 1887876 + 90022144 = 1374^2 + 9488^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91909973 and 91910000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32836 + ... + 35524.

It is an arithmetic number, because the mean of its divisors is an integer number (8049825).

Almost surely, 2^91910020 is an apocalyptic number.

It is an amenable number.

91910020 is an abundant number, since it is smaller than the sum of its proper divisors (101285780).

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

91910020 is a wasteful number, since it uses less digits than its factorization.

91910020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4407 (or 4405 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 91910020 is about 9586.9713674340. The cubic root of 91910020 is about 451.2885209453.

Adding to 91910020 its reverse (2001919), we get a palindrome (93911939).

The spelling of 91910020 in words is "ninety-one million, nine hundred ten thousand, twenty".