20005444 has 6 divisors (see below), whose sum is σ = 35009534. Its totient is φ = 10002720.

The previous prime is 20005441. The next prime is 20005451. The reversal of 20005444 is 44450002.

It can be written as a sum of positive squares in only one way, i.e., 17640000 + 2365444 = 4200^2 + 1538^2 .

It is not an unprimeable number, because it can be changed into a prime (20005441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2500677 + ... + 2500684.

Almost surely, 2^20005444 is an apocalyptic number.

It is an amenable number.

20005444 is a deficient number, since it is larger than the sum of its proper divisors (15004090).

20005444 is a wasteful number, since it uses less digits than its factorization.

20005444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5001365 (or 5001363 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 20005444 is about 4472.7445712895. The cubic root of 20005444 is about 271.4663882410.

Adding to 20005444 its reverse (44450002), we get a palindrome (64455446).

It can be divided in two parts, 20005 and 444, that added together give a square (20449 = 143²).

The spelling of 20005444 in words is "twenty million, five thousand, four hundred forty-four".