20544487 has 2 divisors, whose sum is σ = 20544488. Its totient is φ = 20544486.

The previous prime is 20544481. The next prime is 20544521. The reversal of 20544487 is 78444502.

It is a happy number.

It is an a-pointer prime, because the next prime (20544521) can be obtained adding 20544487 to its sum of digits (34).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20544487 - 2¹⁹ = 20020199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20544481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272243 + 10272244.

It is an arithmetic number, because the mean of its divisors is an integer number (10272244).

Almost surely, 2^20544487 is an apocalyptic number.

20544487 is a deficient number, since it is larger than the sum of its proper divisors (1).

20544487 is an equidigital number, since it uses as much as digits as its factorization.

20544487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 20544487 is about 4532.6026739612. The cubic root of 20544487 is about 273.8830152209.

Adding to 20544487 its reverse (78444502), we get a palindrome (98988989).

The spelling of 20544487 in words is "twenty million, five hundred forty-four thousand, four hundred eighty-seven".