20415244 has 6 divisors (see below), whose sum is σ = 35726684. Its totient is φ = 10207620.

The previous prime is 20415233. The next prime is 20415247. The reversal of 20415244 is 44251402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20415247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2551902 + ... + 2551909.

Almost surely, 2^20415244 is an apocalyptic number.

It is an amenable number.

20415244 is a deficient number, since it is larger than the sum of its proper divisors (15311440).

20415244 is a wasteful number, since it uses less digits than its factorization.

20415244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103815 (or 5103813 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 20415244 is about 4518.3231402811. The cubic root of 20415244 is about 273.3074845012.

Adding to 20415244 its reverse (44251402), we get a palindrome (64666646).

The spelling of 20415244 in words is "twenty million, four hundred fifteen thousand, two hundred forty-four".