90321020 has 12 divisors (see below), whose sum is σ = 189674184. Its totient is φ = 36128400.

The previous prime is 90321019. The next prime is 90321029. The reversal of 90321020 is 2012309.

It is a self number, because there is not a number n which added to its sum of digits gives 90321020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90321029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2258006 + ... + 2258045.

It is an arithmetic number, because the mean of its divisors is an integer number (15806182).

Almost surely, 2^90321020 is an apocalyptic number.

It is an amenable number.

90321020 is an abundant number, since it is smaller than the sum of its proper divisors (99353164).

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

90321020 is a wasteful number, since it uses less digits than its factorization.

90321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516060 (or 4516058 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 90321020 is about 9503.7371596651. The cubic root of 90321020 is about 448.6726648285.

Adding to 90321020 its reverse (2012309), we get a palindrome (92333329).

The spelling of 90321020 in words is "ninety million, three hundred twenty-one thousand, twenty".