20030513 has 4 divisors (see below), whose sum is σ = 20225088. Its totient is φ = 19835940.

The previous prime is 20030497. The next prime is 20030519. The reversal of 20030513 is 31503002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31503002 = 2 ⋅15751501.

It is a cyclic number.

It is not a de Polignac number, because 20030513 - 2⁴ = 20030497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20030519) 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, 97133 + ... + 97338.

It is an arithmetic number, because the mean of its divisors is an integer number (5056272).

Almost surely, 2^20030513 is an apocalyptic number.

It is an amenable number.

20030513 is a deficient number, since it is larger than the sum of its proper divisors (194575).

20030513 is a wasteful number, since it uses less digits than its factorization.

20030513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194574.

The product of its (nonzero) digits is 90, while the sum is 14.

The square root of 20030513 is about 4475.5461119287. The cubic root of 20030513 is about 271.5797332257.

Adding to 20030513 its reverse (31503002), we get a palindrome (51533515).

The spelling of 20030513 in words is "twenty million, thirty thousand, five hundred thirteen".