20780224 has 56 divisors (see below), whose sum is σ = 45354240. Its totient is φ = 9402624.

The previous prime is 20780219. The next prime is 20780237. The reversal of 20780224 is 42208702.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27597 + ... + 28339.

Almost surely, 2^20780224 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 20780224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22677120).

20780224 is an abundant number, since it is smaller than the sum of its proper divisors (24574016).

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

20780224 is a wasteful number, since it uses less digits than its factorization.

20780224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 20780224 is about 4558.5330973900. The cubic root of 20780224 is about 274.9265875665.

Adding to 20780224 its reverse (42208702), we get a palindrome (62988926).

The spelling of 20780224 in words is "twenty million, seven hundred eighty thousand, two hundred twenty-four".