90020920 has 64 divisors (see below), whose sum is σ = 223106400. Its totient is φ = 32417280.

The previous prime is 90020911. The next prime is 90020927. The reversal of 90020920 is 2902009.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 90020891 and 90020900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90020927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47022 + ... + 48898.

Almost surely, 2^90020920 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 90020920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111553200).

90020920 is an abundant number, since it is smaller than the sum of its proper divisors (133085480).

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

90020920 is a wasteful number, since it uses less digits than its factorization.

90020920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2008 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 90020920 is about 9487.9354972512. The cubic root of 90020920 is about 448.1751945536.

Adding to 90020920 its reverse (2902009), we get a palindrome (92922929).

The spelling of 90020920 in words is "ninety million, twenty thousand, nine hundred twenty".