20513330 has 8 divisors (see below), whose sum is σ = 36924012. Its totient is φ = 8205328.

The previous prime is 20513327. The next prime is 20513341. The reversal of 20513330 is 3331502.

It can be written as a sum of positive squares in 2 ways, for example, as 17447329 + 3066001 = 4177^2 + 1751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20513299 and 20513308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025657 + ... + 1025676.

Almost surely, 2^20513330 is an apocalyptic number.

20513330 is a deficient number, since it is larger than the sum of its proper divisors (16410682).

20513330 is a wasteful number, since it uses less digits than its factorization.

20513330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051340.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 20513330 is about 4529.1643820908. The cubic root of 20513330 is about 273.7444915942.

Adding to 20513330 its reverse (3331502), we get a palindrome (23844832).

The spelling of 20513330 in words is "twenty million, five hundred thirteen thousand, three hundred thirty".