20057513 has 6 divisors (see below), whose sum is σ = 23332266. Its totient is φ = 17192112.

The previous prime is 20057509. The next prime is 20057519. The reversal of 20057513 is 31575002.

It can be written as a sum of positive squares in only one way, i.e., 17875984 + 2181529 = 4228^2 + 1477^2 .

It is not a de Polignac number, because 20057513 - 2² = 20057509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20057519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204620 + ... + 204717.

It is an arithmetic number, because the mean of its divisors is an integer number (3888711).

Almost surely, 2^20057513 is an apocalyptic number.

It is an amenable number.

20057513 is a deficient number, since it is larger than the sum of its proper divisors (3274753).

20057513 is an equidigital number, since it uses as much as digits as its factorization.

20057513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409351 (or 409344 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20057513 is about 4478.5614877994. The cubic root of 20057513 is about 271.7017031522.

The spelling of 20057513 in words is "twenty million, fifty-seven thousand, five hundred thirteen".