20430513 has 12 divisors (see below), whose sum is σ = 29773380. Its totient is φ = 13499136.

The previous prime is 20430503. The next prime is 20430517. The reversal of 20430513 is 31503402.

It can be written as a sum of positive squares in 2 ways, for example, as 1272384 + 19158129 = 1128^2 + 4377^2 .

It is not a de Polignac number, because 20430513 - 2¹⁰ = 20429489 is a prime.

It is a super-2 number, since 2×20430513² = 834811722886338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20430517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9028 + ... + 11061.

It is an arithmetic number, because the mean of its divisors is an integer number (2481115).

Almost surely, 2^20430513 is an apocalyptic number.

It is an amenable number.

20430513 is a deficient number, since it is larger than the sum of its proper divisors (9342867).

20430513 is a wasteful number, since it uses less digits than its factorization.

20430513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20208 (or 20205 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 20430513 is about 4520.0124999827. The cubic root of 20430513 is about 273.3756050360.

Adding to 20430513 its reverse (31503402), we get a palindrome (51933915).

The spelling of 20430513 in words is "twenty million, four hundred thirty thousand, five hundred thirteen".