2020621655 has 32 divisors (see below), whose sum is σ = 2701798848. Its totient is φ = 1441152000.

The previous prime is 2020621639. The next prime is 2020621657. The reversal of 2020621655 is 5561260202.

It is not a de Polignac number, because 2020621655 - 2⁴ = 2020621639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020621657) 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 31 ways as a sum of consecutive naturals, for example, 265412 + ... + 272918.

It is an arithmetic number, because the mean of its divisors is an integer number (84431214).

Almost surely, 2^2020621655 is an apocalyptic number.

2020621655 is a deficient number, since it is larger than the sum of its proper divisors (681177193).

2020621655 is a wasteful number, since it uses less digits than its factorization.

2020621655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7667.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 2020621655 is about 44951.3253975898. The cubic root of 2020621655 is about 1264.2365278588.

Adding to 2020621655 its reverse (5561260202), we get a palindrome (7581881857).

The spelling of 2020621655 in words is "two billion, twenty million, six hundred twenty-one thousand, six hundred fifty-five".