820310045 has 4 divisors (see below), whose sum is σ = 984372060. Its totient is φ = 656248032.

The previous prime is 820310033. The next prime is 820310059. The reversal of 820310045 is 540013028.

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 241522681 + 578787364 = 15541^2 + 24058^2 .

It is a cyclic number.

It is not a de Polignac number, because 820310045 - 2¹² = 820305949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 820310045.

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, 82031000 + ... + 82031009.

It is an arithmetic number, because the mean of its divisors is an integer number (246093015).

Almost surely, 2^820310045 is an apocalyptic number.

It is an amenable number.

820310045 is a deficient number, since it is larger than the sum of its proper divisors (164062015).

820310045 is a wasteful number, since it uses less digits than its factorization.

820310045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164062014.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 820310045 is about 28641.0552354483. The cubic root of 820310045 is about 936.1081145509.

The spelling of 820310045 in words is "eight hundred twenty million, three hundred ten thousand, forty-five".