20230513 has 4 divisors (see below), whose sum is σ = 20240100. Its totient is φ = 20220928.

The previous prime is 20230499. The next prime is 20230517. The reversal of 20230513 is 31503202.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31503202 = 2 ⋅15751601.

It can be written as a sum of positive squares in 2 ways, for example, as 20007729 + 222784 = 4473^2 + 472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20230513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20230517) 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, 88 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (5060025).

Almost surely, 2^20230513 is an apocalyptic number.

It is an amenable number.

20230513 is a deficient number, since it is larger than the sum of its proper divisors (9587).

20230513 is an equidigital number, since it uses as much as digits as its factorization.

20230513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9586.

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 20230513 is about 4497.8342566173. The cubic root of 20230513 is about 272.4806281995.

Adding to 20230513 its reverse (31503202), we get a palindrome (51733715).

The spelling of 20230513 in words is "twenty million, two hundred thirty thousand, five hundred thirteen".