4020520 has 64 divisors (see below), whose sum is σ = 10523520. Its totient is φ = 1353984.

The previous prime is 4020503. The next prime is 4020529. The reversal of 4020520 is 250204.

It is a happy number.

4020520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 4020520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23154 + ... + 23326.

It is an arithmetic number, because the mean of its divisors is an integer number (164430).

Almost surely, 2^4020520 is an apocalyptic number.

4020520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4020520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5261760).

4020520 is an abundant number, since it is smaller than the sum of its proper divisors (6503000).

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

4020520 is a wasteful number, since it uses less digits than its factorization.

4020520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 4020520 is about 2005.1234375968. The cubic root of 4020520 is about 159.0110879231.

Adding to 4020520 its reverse (250204), we get a palindrome (4270724).

The spelling of 4020520 in words is "four million, twenty thousand, five hundred twenty".