20712144 has 80 divisors (see below), whose sum is σ = 56817792. Its totient is φ = 6488064.

The previous prime is 20712143. The next prime is 20712151. The reversal of 20712144 is 44121702.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 20712144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20712143) 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, 80464 + ... + 80720.

Almost surely, 2^20712144 is an apocalyptic number.

20712144 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 20712144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28408896).

20712144 is an abundant number, since it is smaller than the sum of its proper divisors (36105648).

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

20712144 is a wasteful number, since it uses less digits than its factorization.

20712144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 20712144 is about 4551.0596568272. The cubic root of 20712144 is about 274.6260216771.

Adding to 20712144 its reverse (44121702), we get a palindrome (64833846).

The spelling of 20712144 in words is "twenty million, seven hundred twelve thousand, one hundred forty-four".