1020840456 has 16 divisors (see below), whose sum is σ = 2552101200. Its totient is φ = 340280144.

The previous prime is 1020840437. The next prime is 1020840467. The reversal of 1020840456 is 6540480201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21267486 + ... + 21267533.

It is an arithmetic number, because the mean of its divisors is an integer number (159506325).

Almost surely, 2^1020840456 is an apocalyptic number.

It is an amenable number.

1020840456 is an abundant number, since it is smaller than the sum of its proper divisors (1531260744).

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

1020840456 is a wasteful number, since it uses less digits than its factorization.

1020840456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42535028 (or 42535024 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 1020840456 is about 31950.5939850889. The cubic root of 1020840456 is about 1006.8991114669.

The spelling of 1020840456 in words is "one billion, twenty million, eight hundred forty thousand, four hundred fifty-six".