20353513 has 4 divisors (see below), whose sum is σ = 20367828. Its totient is φ = 20339200.

The previous prime is 20353511. The next prime is 20353519. The reversal of 20353513 is 31535302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31535302 = 2 ⋅15767651.

It can be written as a sum of positive squares in 2 ways, for example, as 19954089 + 399424 = 4467^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 20353513 - 2¹ = 20353511 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20353511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4756 + ... + 7957.

It is an arithmetic number, because the mean of its divisors is an integer number (5091957).

Almost surely, 2^20353513 is an apocalyptic number.

It is an amenable number.

20353513 is a deficient number, since it is larger than the sum of its proper divisors (14315).

20353513 is a wasteful number, since it uses less digits than its factorization.

20353513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14314.

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 20353513 is about 4511.4867837554. The cubic root of 20353513 is about 273.0317333979.

Adding to 20353513 its reverse (31535302), we get a palindrome (51888815).

The spelling of 20353513 in words is "twenty million, three hundred fifty-three thousand, five hundred thirteen".