20045244 has 48 divisors (see below), whose sum is σ = 50083488. Its totient is φ = 6217728.

The previous prime is 20045243. The next prime is 20045257. The reversal of 20045244 is 44254002.

It is a self number, because there is not a number n which added to its sum of digits gives 20045244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20045243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19282 + ... + 20294.

It is an arithmetic number, because the mean of its divisors is an integer number (1043406).

Almost surely, 2^20045244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20045244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25041744).

20045244 is an abundant number, since it is smaller than the sum of its proper divisors (30038244).

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

20045244 is a wasteful number, since it uses less digits than its factorization.

20045244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20045244 is about 4477.1915304128. The cubic root of 20045244 is about 271.6462926913.

Adding to 20045244 its reverse (44254002), we get a palindrome (64299246).

The spelling of 20045244 in words is "twenty million, forty-five thousand, two hundred forty-four".