820455740 has 24 divisors (see below), whose sum is σ = 1855492800. Its totient is φ = 302937408.

The previous prime is 820455737. The next prime is 820455749. The reversal of 820455740 is 47554028.

820455740 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 820455740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820455749) 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, 1577540 + ... + 1578059.

It is an arithmetic number, because the mean of its divisors is an integer number (77312200).

Almost surely, 2^820455740 is an apocalyptic number.

It is an amenable number.

820455740 is an abundant number, since it is smaller than the sum of its proper divisors (1035037060).

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

820455740 is a wasteful number, since it uses less digits than its factorization.

820455740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3155621 (or 3155619 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 35.

The square root of 820455740 is about 28643.5985867698. The cubic root of 820455740 is about 936.1635318893.

The spelling of 820455740 in words is "eight hundred twenty million, four hundred fifty-five thousand, seven hundred forty".