20413513 has 4 divisors (see below), whose sum is σ = 20447428. Its totient is φ = 20379600.

The previous prime is 20413511. The next prime is 20413537. The reversal of 20413513 is 31531402.

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 4826809 + 15586704 = 2197^2 + 3948^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413513 - 2¹ = 20413511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20413511) 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, 16038 + ... + 17263.

It is an arithmetic number, because the mean of its divisors is an integer number (5111857).

Almost surely, 2^20413513 is an apocalyptic number.

It is an amenable number.

20413513 is a deficient number, since it is larger than the sum of its proper divisors (33915).

20413513 is an equidigital number, since it uses as much as digits as its factorization.

20413513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33914.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20413513 is about 4518.1315828559. The cubic root of 20413513 is about 273.2997597404.

Adding to 20413513 its reverse (31531402), we get a palindrome (51944915).

The spelling of 20413513 in words is "twenty million, four hundred thirteen thousand, five hundred thirteen".