1020020844 has 24 divisors (see below), whose sum is σ = 2381324400. Its totient is φ = 339824704.

The previous prime is 1020020843. The next prime is 1020020849. The reversal of 1020020844 is 4480200201.

It is a self number, because there is not a number n which added to its sum of digits gives 1020020844.

It is not an unprimeable number, because it can be changed into a prime (1020020843) 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, 1582 + ... + 45194.

It is an arithmetic number, because the mean of its divisors is an integer number (99221850).

Almost surely, 2^1020020844 is an apocalyptic number.

It is an amenable number.

1020020844 is an abundant number, since it is smaller than the sum of its proper divisors (1361303556).

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

1020020844 is a wasteful number, since it uses less digits than its factorization.

1020020844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45569 (or 45567 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1020020844 is about 31937.7651691536. The cubic root of 1020020844 is about 1006.6295663905.

The spelling of 1020020844 in words is "one billion, twenty million, twenty thousand, eight hundred forty-four".