43520420 has 24 divisors (see below), whose sum is σ = 93119544. Its totient is φ = 17079296.

The previous prime is 43520419. The next prime is 43520423. The reversal of 43520420 is 2402534.

It can be written as a sum of positive squares in 4 ways, for example, as 1737124 + 41783296 = 1318^2 + 6464^2 .

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 = 43520392 and 43520401.

It is not an unprimeable number, because it can be changed into a prime (43520423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19469 + ... + 21588.

It is an arithmetic number, because the mean of its divisors is an integer number (3879981).

Almost surely, 2^43520420 is an apocalyptic number.

It is an amenable number.

43520420 is an abundant number, since it is smaller than the sum of its proper divisors (49599124).

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

43520420 is a wasteful number, since it uses less digits than its factorization.

43520420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41119 (or 41117 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 43520420 is about 6597.0008337122. Note that the first 3 decimals coincide. The cubic root of 43520420 is about 351.7475053061.

Adding to 43520420 its reverse (2402534), we get a palindrome (45922954).

The spelling of 43520420 in words is "forty-three million, five hundred twenty thousand, four hundred twenty".