20633144 has 24 divisors (see below), whose sum is σ = 44286840. Its totient is φ = 8828208.

The previous prime is 20633113. The next prime is 20633147. The reversal of 20633144 is 44133602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20633147) 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 5 ways as a sum of consecutive naturals, for example, 33689 + ... + 34295.

It is an arithmetic number, because the mean of its divisors is an integer number (1845285).

Almost surely, 2^20633144 is an apocalyptic number.

It is an amenable number.

20633144 is an abundant number, since it is smaller than the sum of its proper divisors (23653696).

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

20633144 is an frugal number, since it uses more digits than its factorization.

20633144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 20633144 is about 4542.3720675436. The cubic root of 20633144 is about 274.2764184391.

Adding to 20633144 its reverse (44133602), we get a palindrome (64766746).

The spelling of 20633144 in words is "twenty million, six hundred thirty-three thousand, one hundred forty-four".