20563144 has 24 divisors (see below), whose sum is σ = 44851590. Its totient is φ = 8812608.

The previous prime is 20563141. The next prime is 20563163. The reversal of 20563144 is 44136502.

It can be written as a sum of positive squares in only one way, i.e., 10640644 + 9922500 = 3262^2 + 3150^2 .

It is not an unprimeable number, because it can be changed into a prime (20563141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25837 + ... + 26620.

Almost surely, 2^20563144 is an apocalyptic number.

It is an amenable number.

20563144 is an abundant number, since it is smaller than the sum of its proper divisors (24288446).

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

20563144 is a wasteful number, since it uses less digits than its factorization.

20563144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52477 (or 52466 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 20563144 is about 4534.6602959869. The cubic root of 20563144 is about 273.9658969757.

Adding to 20563144 its reverse (44136502), we get a palindrome (64699646).

The spelling of 20563144 in words is "twenty million, five hundred sixty-three thousand, one hundred forty-four".