2020311521 has 4 divisors (see below), whose sum is σ = 2053431444. Its totient is φ = 1987191600.

The previous prime is 2020311493. The next prime is 2020311523. The reversal of 2020311521 is 1251130202.

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 217120225 + 1803191296 = 14735^2 + 42464^2 .

It is a cyclic number.

It is not a de Polignac number, because 2020311521 - 2¹⁰ = 2020310497 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 2020311521.

It is not an unprimeable number, because it can be changed into a prime (2020311523) 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, 16559870 + ... + 16559991.

It is an arithmetic number, because the mean of its divisors is an integer number (513357861).

Almost surely, 2^2020311521 is an apocalyptic number.

It is an amenable number.

2020311521 is a deficient number, since it is larger than the sum of its proper divisors (33119923).

2020311521 is an equidigital number, since it uses as much as digits as its factorization.

2020311521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33119922.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2020311521 is about 44947.8756005220. The cubic root of 2020311521 is about 1264.1718443340.

Adding to 2020311521 its reverse (1251130202), we get a palindrome (3271441723).

The spelling of 2020311521 in words is "two billion, twenty million, three hundred eleven thousand, five hundred twenty-one".