2020668521 has 4 divisors (see below), whose sum is σ = 2054917200. Its totient is φ = 1986419844.

The previous prime is 2020668511. The next prime is 2020668527. The reversal of 2020668521 is 1258660202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2020668521 - 2²² = 2016474217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2020668527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17124251 + ... + 17124368.

It is an arithmetic number, because the mean of its divisors is an integer number (513729300).

Almost surely, 2^2020668521 is an apocalyptic number.

It is an amenable number.

2020668521 is a deficient number, since it is larger than the sum of its proper divisors (34248679).

2020668521 is an equidigital number, since it uses as much as digits as its factorization.

2020668521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34248678.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 2020668521 is about 44951.8466917656. The cubic root of 2020668521 is about 1264.2463019550.

The spelling of 2020668521 in words is "two billion, twenty million, six hundred sixty-eight thousand, five hundred twenty-one".