20201020513 has 12 divisors (see below), whose sum is σ = 20920623300. Its totient is φ = 19505418240.

The previous prime is 20201020429. The next prime is 20201020577. The reversal of 20201020513 is 31502010202.

It can be written as a sum of positive squares in 2 ways, for example, as 13789335184 + 6411685329 = 117428^2 + 80073^2 .

It is not a de Polignac number, because 20201020513 - 2¹⁷ = 20200889441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20201020613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 408081 + ... + 454897.

It is an arithmetic number, because the mean of its divisors is an integer number (1743385275).

Almost surely, 2^20201020513 is an apocalyptic number.

It is an amenable number.

20201020513 is a deficient number, since it is larger than the sum of its proper divisors (719602787).

20201020513 is an equidigital number, since it uses as much as digits as its factorization.

20201020513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47328 (or 47297 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 20201020513 its reverse (31502010202), we get a palindrome (51703030715).

The spelling of 20201020513 in words is "twenty billion, two hundred one million, twenty thousand, five hundred thirteen".