1020684845 has 32 divisors (see below), whose sum is σ = 1368679680. Its totient is φ = 726174720.

The previous prime is 1020684839. The next prime is 1020684857. The reversal of 1020684845 is 5484860201.

It is a happy number.

It is not a de Polignac number, because 1020684845 - 2⁸ = 1020684589 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1020684799 and 1020684808.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 989480 + ... + 990510.

It is an arithmetic number, because the mean of its divisors is an integer number (42771240).

Almost surely, 2^1020684845 is an apocalyptic number.

It is an amenable number.

1020684845 is a deficient number, since it is larger than the sum of its proper divisors (347994835).

1020684845 is a wasteful number, since it uses less digits than its factorization.

1020684845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685.

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 1020684845 is about 31948.1587106362. The cubic root of 1020684845 is about 1006.8479469130.

The spelling of 1020684845 in words is "one billion, twenty million, six hundred eighty-four thousand, eight hundred forty-five".