20151444 has 12 divisors (see below), whose sum is σ = 47020064. Its totient is φ = 6717144.

The previous prime is 20151407. The next prime is 20151449. The reversal of 20151444 is 44415102.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 20151444.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20151449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 839632 + ... + 839655.

Almost surely, 2^20151444 is an apocalyptic number.

It is an amenable number.

20151444 is an abundant number, since it is smaller than the sum of its proper divisors (26868620).

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

20151444 is a wasteful number, since it uses less digits than its factorization.

20151444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679294 (or 1679292 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 20151444 is about 4489.0359766881. The cubic root of 20151444 is about 272.1251766687.

Adding to 20151444 its reverse (44415102), we get a palindrome (64566546).

The spelling of 20151444 in words is "twenty million, one hundred fifty-one thousand, four hundred forty-four".