1020840854 has 48 divisors (see below), whose sum is σ = 1866967056. Its totient is φ = 413683200.

The previous prime is 1020840829. The next prime is 1020840857. The reversal of 1020840854 is 4580480201.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020840854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020840857) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 131234 + ... + 138794.

It is an arithmetic number, because the mean of its divisors is an integer number (38895147).

Almost surely, 2^1020840854 is an apocalyptic number.

1020840854 is a deficient number, since it is larger than the sum of its proper divisors (846126202).

1020840854 is a wasteful number, since it uses less digits than its factorization.

1020840854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7629 (or 7610 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 1020840854 is about 31950.6002134545. The cubic root of 1020840854 is about 1006.8992423218.

The spelling of 1020840854 in words is "one billion, twenty million, eight hundred forty thousand, eight hundred fifty-four".