9091220020 has 24 divisors (see below), whose sum is σ = 19213170984. Its totient is φ = 3613324416.

The previous prime is 9091219967. The next prime is 9091220041. The reversal of 9091220020 is 200221909.

It can be written as a sum of positive squares in 4 ways, for example, as 187032976 + 8904187044 = 13676^2 + 94362^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1444507 + ... + 1450786.

It is an arithmetic number, because the mean of its divisors is an integer number (800548791).

Almost surely, 2^9091220020 is an apocalyptic number.

It is an amenable number.

9091220020 is an abundant number, since it is smaller than the sum of its proper divisors (10121950964).

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

9091220020 is a wasteful number, since it uses less digits than its factorization.

9091220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2895459 (or 2895457 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 9091220020 is about 95347.8894365261. The cubic root of 9091220020 is about 2087.0878162123.

Adding to 9091220020 its reverse (200221909), we get a palindrome (9291441929).

The spelling of 9091220020 in words is "nine billion, ninety-one million, two hundred twenty thousand, twenty".