20703144 has 128 divisors (see below), whose sum is σ = 68428800. Its totient is φ = 5053440.

The previous prime is 20703143. The next prime is 20703191. The reversal of 20703144 is 44130702.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 20703144.

It is not an unprimeable number, because it can be changed into a prime (20703143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31087 + ... + 31745.

It is an arithmetic number, because the mean of its divisors is an integer number (534600).

Almost surely, 2^20703144 is an apocalyptic number.

20703144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20703144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34214400).

20703144 is an abundant number, since it is smaller than the sum of its proper divisors (47725656).

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

20703144 is a wasteful number, since it uses less digits than its factorization.

20703144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20703144 is about 4550.0707686804. The cubic root of 20703144 is about 274.5862383776.

Adding to 20703144 its reverse (44130702), we get a palindrome (64833846).

The spelling of 20703144 in words is "twenty million, seven hundred three thousand, one hundred forty-four".