2020640645 has 8 divisors (see below), whose sum is σ = 2428441080. Its totient is φ = 1614064320.

The previous prime is 2020640639. The next prime is 2020640647. The reversal of 2020640645 is 5460460202.

2020640645 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 144624676 + 1876015969 = 12026^2 + 43313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2020640645 - 2⁸ = 2020640389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2020640647) 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, 302390 + ... + 308999.

It is an arithmetic number, because the mean of its divisors is an integer number (303555135).

Almost surely, 2^2020640645 is an apocalyptic number.

It is an amenable number.

2020640645 is a deficient number, since it is larger than the sum of its proper divisors (407800435).

2020640645 is an equidigital number, since it uses as much as digits as its factorization.

2020640645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612055.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 2020640645 is about 44951.5366255704. The cubic root of 2020640645 is about 1264.2404883193.

The spelling of 2020640645 in words is "two billion, twenty million, six hundred forty thousand, six hundred forty-five".