4491020 has 24 divisors (see below), whose sum is σ = 9471168. Its totient is φ = 1788800.

The previous prime is 4491013. The next prime is 4491031. The reversal of 4491020 is 201944.

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 = 4490983 and 4491001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8360 + ... + 8880.

It is an arithmetic number, because the mean of its divisors is an integer number (394632).

Almost surely, 2^4491020 is an apocalyptic number.

It is an amenable number.

4491020 is an abundant number, since it is smaller than the sum of its proper divisors (4980148).

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

4491020 is a wasteful number, since it uses less digits than its factorization.

4491020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 4491020 is about 2119.2026802550. The cubic root of 4491020 is about 164.9864696588.

Adding to 4491020 its reverse (201944), we get a palindrome (4692964).

The spelling of 4491020 in words is "four million, four hundred ninety-one thousand, twenty".