90020000 has 120 divisors (see below), whose sum is σ = 253493856. Its totient is φ = 30816000.

The previous prime is 90019997. The next prime is 90020003. The reversal of 90020000 is 2009.

It is an interprime number because it is at equal distance from previous prime (90019997) and next prime (90020003).

It is not an unprimeable number, because it can be changed into a prime (90020003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 139679 + ... + 140321.

Almost surely, 2^90020000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126746928).

90020000 is an abundant number, since it is smaller than the sum of its proper divisors (163473856).

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

90020000 is an equidigital number, since it uses as much as digits as its factorization.

90020000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 90020000 is about 9487.8870145043. The cubic root of 90020000 is about 448.1736677878.

Adding to 90020000 its reverse (2009), we get a palindrome (90022009).

The spelling of 90020000 in words is "ninety million, twenty thousand".