20415444 has 48 divisors (see below), whose sum is σ = 56813568. Its totient is φ = 5578848.

The previous prime is 20415431. The next prime is 20415457. The reversal of 20415444 is 44451402.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20415431) and next prime (20415457).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3352 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (1183616).

Almost surely, 2^20415444 is an apocalyptic number.

It is an amenable number.

20415444 is an abundant number, since it is smaller than the sum of its proper divisors (36398124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20415444 is a wasteful number, since it uses less digits than its factorization.

20415444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10604 (or 10602 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 20415444 is about 4518.3452723315. The cubic root of 20415444 is about 273.3083769931.

Adding to 20415444 its reverse (44451402), we get a palindrome (64866846).

The spelling of 20415444 in words is "twenty million, four hundred fifteen thousand, four hundred forty-four".