20513344 has 14 divisors (see below), whose sum is σ = 40706294. Its totient is φ = 10256640.

The previous prime is 20513341. The next prime is 20513371. The reversal of 20513344 is 44331502.

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 82944 = 4520^2 + 288^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20513341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160197 + ... + 160324.

Almost surely, 2^20513344 is an apocalyptic number.

It is an amenable number.

20513344 is a deficient number, since it is larger than the sum of its proper divisors (20192950).

20513344 is an equidigital number, since it uses as much as digits as its factorization.

20513344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320533 (or 320523 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 20513344 is about 4529.1659276295. The cubic root of 20513344 is about 273.7445538695.

Adding to 20513344 its reverse (44331502), we get a palindrome (64844846).

The spelling of 20513344 in words is "twenty million, five hundred thirteen thousand, three hundred forty-four".