20303444 has 36 divisors (see below), whose sum is σ = 41942880. Its totient is φ = 8573040.

The previous prime is 20303441. The next prime is 20303447. The reversal of 20303444 is 44430302.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20303441) and next prime (20303447).

It is a super-2 number, since 2×20303444² = 824459676522272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303441) 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 11 ways as a sum of consecutive naturals, for example, 13187 + ... + 14645.

It is an arithmetic number, because the mean of its divisors is an integer number (1165080).

Almost surely, 2^20303444 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 20303444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20971440).

20303444 is an abundant number, since it is smaller than the sum of its proper divisors (21639436).

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

20303444 is a wasteful number, since it uses less digits than its factorization.

20303444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1539 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20303444 is about 4505.9343093303. The cubic root of 20303444 is about 272.8076664140.

Adding to 20303444 its reverse (44430302), we get a palindrome (64733746).

The spelling of 20303444 in words is "twenty million, three hundred three thousand, four hundred forty-four".