820560445 has 4 divisors (see below), whose sum is σ = 984672540. Its totient is φ = 656448352.

The previous prime is 820560413. The next prime is 820560463. The reversal of 820560445 is 544065028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 368870436 + 451690009 = 19206^2 + 21253^2 .

It is a cyclic number.

It is not a de Polignac number, because 820560445 - 2⁵ = 820560413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820560445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82056040 + ... + 82056049.

It is an arithmetic number, because the mean of its divisors is an integer number (246168135).

Almost surely, 2^820560445 is an apocalyptic number.

It is an amenable number.

820560445 is a deficient number, since it is larger than the sum of its proper divisors (164112095).

820560445 is a wasteful number, since it uses less digits than its factorization.

820560445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164112094.

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 820560445 is about 28645.4262492287. The cubic root of 820560445 is about 936.2033539980.

The spelling of 820560445 in words is "eight hundred twenty million, five hundred sixty thousand, four hundred forty-five".