2020555621 has 12 divisors (see below), whose sum is σ = 2488704588. Its totient is φ = 1630027392.

The previous prime is 2020555619. The next prime is 2020555633. The reversal of 2020555621 is 1265550202.

It can be written as a sum of positive squares in 2 ways, for example, as 708304996 + 1312250625 = 26614^2 + 36225^2 .

It is not a de Polignac number, because 2020555621 - 2¹ = 2020555619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2020555621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020555651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1211986 + ... + 1213651.

It is an arithmetic number, because the mean of its divisors is an integer number (207392049).

Almost surely, 2^2020555621 is an apocalyptic number.

It is an amenable number.

2020555621 is a deficient number, since it is larger than the sum of its proper divisors (468148967).

2020555621 is a wasteful number, since it uses less digits than its factorization.

2020555621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425668 (or 2425661 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 2020555621 is about 44950.5908859939. The cubic root of 2020555621 is about 1264.2227559413. Note that the first 3 decimals are identical.

The spelling of 2020555621 in words is "two billion, twenty million, five hundred fifty-five thousand, six hundred twenty-one".