20000513 has 4 divisors (see below), whose sum is σ = 21539028. Its totient is φ = 18462000.

The previous prime is 20000507. The next prime is 20000531. The reversal of 20000513 is 31500002.

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 8898289 + 11102224 = 2983^2 + 3332^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20000513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000494 and 20000503.

It is not an unprimeable number, because it can be changed into a prime (20000503) 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, 769238 + ... + 769263.

It is an arithmetic number, because the mean of its divisors is an integer number (5384757).

Almost surely, 2^20000513 is an apocalyptic number.

It is an amenable number.

20000513 is a deficient number, since it is larger than the sum of its proper divisors (1538515).

20000513 is a wasteful number, since it uses less digits than its factorization.

20000513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538514.

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 20000513 is about 4472.1933097754. The cubic root of 20000513 is about 271.4440824667. Note that the first 3 decimals are identical.

Adding to 20000513 its reverse (31500002), we get a palindrome (51500515).

The spelling of 20000513 in words is "twenty million, five hundred thirteen", and thus it is an aban number.