90009020 has 24 divisors (see below), whose sum is σ = 190696464. Its totient is φ = 35684096.

The previous prime is 90009001. The next prime is 90009037. The reversal of 90009020 is 2090009.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 90008983 and 90009001.

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, 17654 + ... + 22173.

It is an arithmetic number, because the mean of its divisors is an integer number (7945686).

Almost surely, 2^90009020 is an apocalyptic number.

It is an amenable number.

90009020 is an abundant number, since it is smaller than the sum of its proper divisors (100687444).

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

90009020 is a wasteful number, since it uses less digits than its factorization.

90009020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39949 (or 39947 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 90009020 is about 9487.3083643360. The cubic root of 90009020 is about 448.1554453670.

Adding to 90009020 its reverse (2090009), we get a palindrome (92099029).

The spelling of 90009020 in words is "ninety million, nine thousand, twenty".