2020757645 has 4 divisors (see below), whose sum is σ = 2424909180. Its totient is φ = 1616606112.

The previous prime is 2020757593. The next prime is 2020757657. The reversal of 2020757645 is 5467570202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 422836969 + 1597920676 = 20563^2 + 39974^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020757645 - 2¹² = 2020753549 is a prime.

It is a super-3 number, since 3×2020757645³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 2020757599 and 2020757608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202075760 + ... + 202075769.

It is an arithmetic number, because the mean of its divisors is an integer number (606227295).

Almost surely, 2^2020757645 is an apocalyptic number.

It is an amenable number.

2020757645 is a deficient number, since it is larger than the sum of its proper divisors (404151535).

2020757645 is an equidigital number, since it uses as much as digits as its factorization.

2020757645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404151534.

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 2020757645 is about 44952.8380082949. The cubic root of 2020757645 is about 1264.2648887130.

The spelling of 2020757645 in words is "two billion, twenty million, seven hundred fifty-seven thousand, six hundred forty-five".